Sending message in chat throws exception (GetStreamingResponseAsync)

[ntark]

Description

Sending any message in chat after creating a project from template throws an exception.

Tried both on my Windows 11 machine and Oracle Linux node.

StackTrace:

Waiting for resource 'ollama' to enter the 'Running' state.
Waiting for resource 'chat' to enter the 'Running' state.
Waiting for resource 'ollama' to enter the 'Running' state.
Waiting for resource 'embeddings' to enter the 'Running' state.
Waiting for resource 'vectordb' to enter the 'Running' state.
Waiting for resource 'chat' to become healthy.
Waiting for resource 'ollama' to become healthy.
Waiting for resource 'ollama' to become healthy.
Waiting for resource 'embeddings' to become healthy.
Waiting for resource ready to execute for 'ollama'.
Finished waiting for resource 'ollama'.
Waiting for resource ready to execute for 'ollama'.
Finished waiting for resource 'ollama'.
Waiting for resource 'vectordb' to become healthy.
Waiting for resource ready to execute for 'vectordb'.
Finished waiting for resource 'vectordb'.
Waiting for resource ready to execute for 'embeddings'.
Finished waiting for resource 'embeddings'.
Waiting for resource ready to execute for 'chat'.
Finished waiting for resource 'chat'.
dbug: Microsoft.AspNetCore.Watch.BrowserRefresh.BlazorWasmHotReloadMiddleware[0]
      Middleware loaded
dbug: Microsoft.AspNetCore.Watch.BrowserRefresh.BrowserScriptMiddleware[0]
      Middleware loaded. Script /_framework/aspnetcore-browser-refresh.js (16509 B).
dbug: Microsoft.AspNetCore.Watch.BrowserRefresh.BrowserScriptMiddleware[0]
      Middleware loaded. Script /_framework/blazor-hotreload.js (799 B).
dbug: Microsoft.AspNetCore.Watch.BrowserRefresh.BrowserRefreshMiddleware[0]
      Middleware loaded: DOTNET_MODIFIABLE_ASSEMBLIES=debug, __ASPNETCORE_BROWSER_TOOLS=true
info: Microsoft.Hosting.Lifetime[14]
      Now listening on: https://localhost:62226
info: Microsoft.Hosting.Lifetime[14]
      Now listening on: http://localhost:62227
info: Microsoft.Hosting.Lifetime[0]
      Application started. Press Ctrl+C to shut down.
info: Microsoft.Hosting.Lifetime[0]
      Hosting environment: Development
info: Microsoft.Hosting.Lifetime[0]
      Content root path: C:\Users\nikatark\source\repos\GraphQL\ChatApp1\ChatApp1.Web
dbug: Microsoft.AspNetCore.Watch.BrowserRefresh.BrowserRefreshMiddleware[1]
      Response markup is scheduled to include browser refresh script injection.
dbug: Microsoft.AspNetCore.Watch.BrowserRefresh.BrowserRefreshMiddleware[2]
      Response markup was updated to include browser refresh script injection.
dbug: Microsoft.AspNetCore.Watch.BrowserRefresh.BrowserScriptMiddleware[0]
      Script injected: /_framework/aspnetcore-browser-refresh.js
warn: Microsoft.AspNetCore.Components.Server.Circuits.RemoteRenderer[100]
      Unhandled exception rendering component: The JSON value could not be converted to System.String. Path: $.properties.filenameFilter.type | LineNumber: 0 | BytePositionInLine: 265.
      System.Text.Json.JsonException: The JSON value could not be converted to System.String. Path: $.properties.filenameFilter.type | LineNumber: 0 | BytePositionInLine: 265.
       ---> System.InvalidOperationException: Cannot get the value of a token type 'StartArray' as a string.
         at System.Text.Json.ThrowHelper.ThrowInvalidOperationException_ExpectedString(JsonTokenType tokenType)
         at System.Text.Json.Utf8JsonReader.GetString()
         at System.Text.Json.Serialization.Metadata.JsonPropertyInfo`1.ReadJsonAndSetMember(Object obj, ReadStack& state, Utf8JsonReader& reader)
         at System.Text.Json.Serialization.Converters.ObjectDefaultConverter`1.OnTryRead(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options, ReadStack& state, T& value)
         at System.Text.Json.Serialization.JsonConverter`1.TryRead(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options, ReadStack& state, T& value, Boolean& isPopulatedValue)
         at System.Text.Json.Serialization.JsonDictionaryConverter`3.OnTryRead(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options, ReadStack& state, TDictionary& value)
         at System.Text.Json.Serialization.JsonConverter`1.TryRead(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options, ReadStack& state, T& value, Boolean& isPopulatedValue)
         at System.Text.Json.Serialization.Metadata.JsonPropertyInfo`1.ReadJsonAndSetMember(Object obj, ReadStack& state, Utf8JsonReader& reader)
         at System.Text.Json.Serialization.Converters.ObjectDefaultConverter`1.OnTryRead(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options, ReadStack& state, T& value)
         at System.Text.Json.Serialization.JsonConverter`1.TryRead(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options, ReadStack& state, T& value, Boolean& isPopulatedValue)
         at System.Text.Json.Serialization.JsonConverter`1.ReadCore(Utf8JsonReader& reader, T& value, JsonSerializerOptions options, ReadStack& state)
         --- End of inner exception stack trace ---
         at System.Text.Json.ThrowHelper.ReThrowWithPath(ReadStack& state, Utf8JsonReader& reader, Exception ex)
         at System.Text.Json.Serialization.JsonConverter`1.ReadCore(Utf8JsonReader& reader, T& value, JsonSerializerOptions options, ReadStack& state)
         at System.Text.Json.Serialization.Metadata.JsonTypeInfo`1.Deserialize(Utf8JsonReader& reader, ReadStack& state)
         at System.Text.Json.JsonSerializer.ReadFromSpan[TValue](ReadOnlySpan`1 utf8Json, JsonTypeInfo`1 jsonTypeInfo, Nullable`1 actualByteCount)
         at System.Text.Json.JsonSerializer.Deserialize[TValue](JsonElement element, JsonSerializerOptions options)
         at OllamaSharp.MicrosoftAi.AbstractionMapper.ToOllamaSharpTool(AIFunctionDeclaration function)
         at OllamaSharp.MicrosoftAi.AbstractionMapper.ToOllamaSharpTool(AITool tool)
         at System.Linq.Enumerable.ListSelectIterator`2.MoveNext()
         at System.Linq.Enumerable.IEnumerableWhereIterator`1.MoveNext()
         at System.Text.Json.Serialization.Converters.IEnumerableDefaultConverter`2.OnWriteResume(Utf8JsonWriter writer, TCollection value, JsonSerializerOptions options, WriteStack& state)
         at System.Text.Json.Serialization.JsonCollectionConverter`2.OnTryWrite(Utf8JsonWriter writer, TCollection value, JsonSerializerOptions options, WriteStack& state)
         at System.Text.Json.Serialization.JsonConverter`1.TryWrite(Utf8JsonWriter writer, T& value, JsonSerializerOptions options, WriteStack& state)
         at System.Text.Json.Serialization.Metadata.JsonPropertyInfo`1.GetMemberAndWriteJson(Object obj, WriteStack& state, Utf8JsonWriter writer)
         at System.Text.Json.Serialization.Converters.ObjectDefaultConverter`1.OnTryWrite(Utf8JsonWriter writer, T value, JsonSerializerOptions options, WriteStack& state)
         at System.Text.Json.Serialization.JsonConverter`1.TryWrite(Utf8JsonWriter writer, T& value, JsonSerializerOptions options, WriteStack& state)
         at System.Text.Json.Serialization.JsonConverter`1.WriteCore(Utf8JsonWriter writer, T& value, JsonSerializerOptions options, WriteStack& state)
         at System.Text.Json.Serialization.Metadata.JsonTypeInfo`1.Serialize(Utf8JsonWriter writer, T& rootValue, Object rootValueBoxed)
         at System.Text.Json.JsonSerializer.WriteString[TValue](TValue& value, JsonTypeInfo`1 jsonTypeInfo)
         at System.Text.Json.JsonSerializer.Serialize[TValue](TValue value, JsonSerializerOptions options)
         at OllamaSharp.OllamaApiClient.ChatAsync(ChatRequest request, CancellationToken cancellationToken)+MoveNext()
         at OllamaSharp.OllamaApiClient.ChatAsync(ChatRequest request, CancellationToken cancellationToken)+System.Threading.Tasks.Sources.IValueTaskSource<System.Boolean>.GetResult()
         at OllamaSharp.OllamaApiClient.Microsoft.Extensions.AI.IChatClient.GetStreamingResponseAsync(IEnumerable`1 messages, ChatOptions options, CancellationToken cancellationToken)+MoveNext()
         at OllamaSharp.OllamaApiClient.Microsoft.Extensions.AI.IChatClient.GetStreamingResponseAsync(IEnumerable`1 messages, ChatOptions options, CancellationToken cancellationToken)+MoveNext()
         at OllamaSharp.OllamaApiClient.Microsoft.Extensions.AI.IChatClient.GetStreamingResponseAsync(IEnumerable`1 messages, ChatOptions options, CancellationToken cancellationToken)+System.Threading.Tasks.Sources.IValueTaskSource<System.Boolean>.GetResult()
         at Microsoft.Extensions.AI.OpenTelemetryChatClient.GetStreamingResponseAsync(IEnumerable`1 messages, ChatOptions options, CancellationToken cancellationToken)+MoveNext()
         at Microsoft.Extensions.AI.OpenTelemetryChatClient.GetStreamingResponseAsync(IEnumerable`1 messages, ChatOptions options, CancellationToken cancellationToken)+MoveNext()
         at Microsoft.Extensions.AI.OpenTelemetryChatClient.GetStreamingResponseAsync(IEnumerable`1 messages, ChatOptions options, CancellationToken cancellationToken)+System.Threading.Tasks.Sources.IValueTaskSource<System.Boolean>.GetResult()
         at Microsoft.Extensions.AI.OpenTelemetryChatClient.GetStreamingResponseAsync(IEnumerable`1 messages, ChatOptions options, CancellationToken cancellationToken)+MoveNext()
         at Microsoft.Extensions.AI.OpenTelemetryChatClient.GetStreamingResponseAsync(IEnumerable`1 messages, ChatOptions options, CancellationToken cancellationToken)+MoveNext()
         at Microsoft.Extensions.AI.OpenTelemetryChatClient.GetStreamingResponseAsync(IEnumerable`1 messages, ChatOptions options, CancellationToken cancellationToken)+System.Threading.Tasks.Sources.IValueTaskSource<System.Boolean>.GetResult()
         at Microsoft.Extensions.AI.FunctionInvokingChatClient.GetStreamingResponseAsync(IEnumerable`1 messages, ChatOptions options, CancellationToken cancellationToken)+MoveNext()
         at Microsoft.Extensions.AI.FunctionInvokingChatClient.GetStreamingResponseAsync(IEnumerable`1 messages, ChatOptions options, CancellationToken cancellationToken)+MoveNext()
         at Microsoft.Extensions.AI.FunctionInvokingChatClient.GetStreamingResponseAsync(IEnumerable`1 messages, ChatOptions options, CancellationToken cancellationToken)+System.Threading.Tasks.Sources.IValueTaskSource<System.Boolean>.GetResult()
         at ChatApp1.Web.Components.Pages.Chat.Chat.AddUserMessageAsync(ChatMessage userMessage) in C:\Users\nikatark\source\repos\GraphQL\ChatApp1\ChatApp1.Web\Components\Pages\Chat\Chat.razor:line 76
         at ChatApp1.Web.Components.Pages.Chat.Chat.AddUserMessageAsync(ChatMessage userMessage) in C:\Users\nikatark\source\repos\GraphQL\ChatApp1\ChatApp1.Web\Components\Pages\Chat\Chat.razor:line 76
         at Microsoft.AspNetCore.Components.ComponentBase.CallStateHasChangedOnAsyncCompletion(Task task)
         at ChatApp1.Web.Components.Pages.Chat.ChatInput.SendMessageAsync() in C:\Users\nikatark\source\repos\GraphQL\ChatApp1\ChatApp1.Web\Components\Pages\Chat\ChatInput.razor:line 32
         at Microsoft.AspNetCore.Components.ComponentBase.CallStateHasChangedOnAsyncCompletion(Task task)
         at Microsoft.AspNetCore.Components.Forms.EditForm.HandleSubmitAsync()
         at Microsoft.AspNetCore.Components.ComponentBase.CallStateHasChangedOnAsyncCompletion(Task task)
         at Microsoft.AspNetCore.Components.RenderTree.Renderer.GetErrorHandledTask(Task taskToHandle, ComponentState owningComponentState)
fail: Microsoft.AspNetCore.Components.Server.Circuits.CircuitHost[111]
      Unhandled exception in circuit '8A98X8AdRQK18qp6tNv8cqy2v41UcSudkih_VmqZUaI'.
      System.Text.Json.JsonException: The JSON value could not be converted to System.String. Path: $.properties.filenameFilter.type | LineNumber: 0 | BytePositionInLine: 265.
       ---> System.InvalidOperationException: Cannot get the value of a token type 'StartArray' as a string.
         at System.Text.Json.ThrowHelper.ThrowInvalidOperationException_ExpectedString(JsonTokenType tokenType)
         at System.Text.Json.Utf8JsonReader.GetString()
         at System.Text.Json.Serialization.Metadata.JsonPropertyInfo`1.ReadJsonAndSetMember(Object obj, ReadStack& state, Utf8JsonReader& reader)
         at System.Text.Json.Serialization.Converters.ObjectDefaultConverter`1.OnTryRead(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options, ReadStack& state, T& value)
         at System.Text.Json.Serialization.JsonConverter`1.TryRead(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options, ReadStack& state, T& value, Boolean& isPopulatedValue)
         at System.Text.Json.Serialization.JsonDictionaryConverter`3.OnTryRead(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options, ReadStack& state, TDictionary& value)
         at System.Text.Json.Serialization.JsonConverter`1.TryRead(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options, ReadStack& state, T& value, Boolean& isPopulatedValue)
         at System.Text.Json.Serialization.Metadata.JsonPropertyInfo`1.ReadJsonAndSetMember(Object obj, ReadStack& state, Utf8JsonReader& reader)
         at System.Text.Json.Serialization.Converters.ObjectDefaultConverter`1.OnTryRead(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options, ReadStack& state, T& value)
         at System.Text.Json.Serialization.JsonConverter`1.TryRead(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options, ReadStack& state, T& value, Boolean& isPopulatedValue)
         at System.Text.Json.Serialization.JsonConverter`1.ReadCore(Utf8JsonReader& reader, T& value, JsonSerializerOptions options, ReadStack& state)
         --- End of inner exception stack trace ---
         at System.Text.Json.ThrowHelper.ReThrowWithPath(ReadStack& state, Utf8JsonReader& reader, Exception ex)
         at System.Text.Json.Serialization.JsonConverter`1.ReadCore(Utf8JsonReader& reader, T& value, JsonSerializerOptions options, ReadStack& state)
         at System.Text.Json.Serialization.Metadata.JsonTypeInfo`1.Deserialize(Utf8JsonReader& reader, ReadStack& state)
         at System.Text.Json.JsonSerializer.ReadFromSpan[TValue](ReadOnlySpan`1 utf8Json, JsonTypeInfo`1 jsonTypeInfo, Nullable`1 actualByteCount)
         at System.Text.Json.JsonSerializer.Deserialize[TValue](JsonElement element, JsonSerializerOptions options)
         at OllamaSharp.MicrosoftAi.AbstractionMapper.ToOllamaSharpTool(AIFunctionDeclaration function)
         at OllamaSharp.MicrosoftAi.AbstractionMapper.ToOllamaSharpTool(AITool tool)
         at System.Linq.Enumerable.ListSelectIterator`2.MoveNext()
         at System.Linq.Enumerable.IEnumerableWhereIterator`1.MoveNext()
         at System.Text.Json.Serialization.Converters.IEnumerableDefaultConverter`2.OnWriteResume(Utf8JsonWriter writer, TCollection value, JsonSerializerOptions options, WriteStack& state)
         at System.Text.Json.Serialization.JsonCollectionConverter`2.OnTryWrite(Utf8JsonWriter writer, TCollection value, JsonSerializerOptions options, WriteStack& state)
         at System.Text.Json.Serialization.JsonConverter`1.TryWrite(Utf8JsonWriter writer, T& value, JsonSerializerOptions options, WriteStack& state)
         at System.Text.Json.Serialization.Metadata.JsonPropertyInfo`1.GetMemberAndWriteJson(Object obj, WriteStack& state, Utf8JsonWriter writer)
         at System.Text.Json.Serialization.Converters.ObjectDefaultConverter`1.OnTryWrite(Utf8JsonWriter writer, T value, JsonSerializerOptions options, WriteStack& state)
         at System.Text.Json.Serialization.JsonConverter`1.TryWrite(Utf8JsonWriter writer, T& value, JsonSerializerOptions options, WriteStack& state)
         at System.Text.Json.Serialization.JsonConverter`1.WriteCore(Utf8JsonWriter writer, T& value, JsonSerializerOptions options, WriteStack& state)
         at System.Text.Json.Serialization.Metadata.JsonTypeInfo`1.Serialize(Utf8JsonWriter writer, T& rootValue, Object rootValueBoxed)
         at System.Text.Json.JsonSerializer.WriteString[TValue](TValue& value, JsonTypeInfo`1 jsonTypeInfo)
         at System.Text.Json.JsonSerializer.Serialize[TValue](TValue value, JsonSerializerOptions options)
         at OllamaSharp.OllamaApiClient.ChatAsync(ChatRequest request, CancellationToken cancellationToken)+MoveNext()
         at OllamaSharp.OllamaApiClient.ChatAsync(ChatRequest request, CancellationToken cancellationToken)+System.Threading.Tasks.Sources.IValueTaskSource<System.Boolean>.GetResult()
         at OllamaSharp.OllamaApiClient.Microsoft.Extensions.AI.IChatClient.GetStreamingResponseAsync(IEnumerable`1 messages, ChatOptions options, CancellationToken cancellationToken)+MoveNext()
         at OllamaSharp.OllamaApiClient.Microsoft.Extensions.AI.IChatClient.GetStreamingResponseAsync(IEnumerable`1 messages, ChatOptions options, CancellationToken cancellationToken)+MoveNext()
         at OllamaSharp.OllamaApiClient.Microsoft.Extensions.AI.IChatClient.GetStreamingResponseAsync(IEnumerable`1 messages, ChatOptions options, CancellationToken cancellationToken)+System.Threading.Tasks.Sources.IValueTaskSource<System.Boolean>.GetResult()
         at Microsoft.Extensions.AI.OpenTelemetryChatClient.GetStreamingResponseAsync(IEnumerable`1 messages, ChatOptions options, CancellationToken cancellationToken)+MoveNext()
         at Microsoft.Extensions.AI.OpenTelemetryChatClient.GetStreamingResponseAsync(IEnumerable`1 messages, ChatOptions options, CancellationToken cancellationToken)+MoveNext()
         at Microsoft.Extensions.AI.OpenTelemetryChatClient.GetStreamingResponseAsync(IEnumerable`1 messages, ChatOptions options, CancellationToken cancellationToken)+System.Threading.Tasks.Sources.IValueTaskSource<System.Boolean>.GetResult()
         at Microsoft.Extensions.AI.OpenTelemetryChatClient.GetStreamingResponseAsync(IEnumerable`1 messages, ChatOptions options, CancellationToken cancellationToken)+MoveNext()
         at Microsoft.Extensions.AI.OpenTelemetryChatClient.GetStreamingResponseAsync(IEnumerable`1 messages, ChatOptions options, CancellationToken cancellationToken)+MoveNext()
         at Microsoft.Extensions.AI.OpenTelemetryChatClient.GetStreamingResponseAsync(IEnumerable`1 messages, ChatOptions options, CancellationToken cancellationToken)+System.Threading.Tasks.Sources.IValueTaskSource<System.Boolean>.GetResult()
         at Microsoft.Extensions.AI.FunctionInvokingChatClient.GetStreamingResponseAsync(IEnumerable`1 messages, ChatOptions options, CancellationToken cancellationToken)+MoveNext()
         at Microsoft.Extensions.AI.FunctionInvokingChatClient.GetStreamingResponseAsync(IEnumerable`1 messages, ChatOptions options, CancellationToken cancellationToken)+MoveNext()
         at Microsoft.Extensions.AI.FunctionInvokingChatClient.GetStreamingResponseAsync(IEnumerable`1 messages, ChatOptions options, CancellationToken cancellationToken)+System.Threading.Tasks.Sources.IValueTaskSource<System.Boolean>.GetResult()
         at ChatApp1.Web.Components.Pages.Chat.Chat.AddUserMessageAsync(ChatMessage userMessage) in C:\Users\nikatark\source\repos\GraphQL\ChatApp1\ChatApp1.Web\Components\Pages\Chat\Chat.razor:line 76
         at ChatApp1.Web.Components.Pages.Chat.Chat.AddUserMessageAsync(ChatMessage userMessage) in C:\Users\nikatark\source\repos\GraphQL\ChatApp1\ChatApp1.Web\Components\Pages\Chat\Chat.razor:line 76
         at Microsoft.AspNetCore.Components.ComponentBase.CallStateHasChangedOnAsyncCompletion(Task task)
         at ChatApp1.Web.Components.Pages.Chat.ChatInput.SendMessageAsync() in C:\Users\nikatark\source\repos\GraphQL\ChatApp1\ChatApp1.Web\Components\Pages\Chat\ChatInput.razor:line 32
         at Microsoft.AspNetCore.Components.ComponentBase.CallStateHasChangedOnAsyncCompletion(Task task)
         at Microsoft.AspNetCore.Components.Forms.EditForm.HandleSubmitAsync()
         at Microsoft.AspNetCore.Components.ComponentBase.CallStateHasChangedOnAsyncCompletion(Task task)
         at Microsoft.AspNetCore.Components.RenderTree.Renderer.GetErrorHandledTask(Task taskToHandle, ComponentState owningComponentState)

Reproduction Steps

• Install Microsoft.Templates.AI
• Create new AI Chat Web App
• Select AI Service Provider - Ollama
• Vector Store - Qdrant
• Untick Use keyless authentication for Azure service
• Tick Use Aspire orchestration

Send anything in chat.
Exception is thrown.

Expected behavior

Chat responds with answer, like in that example video: https://www.youtube.com/watch?v=pQivzi4n6jM

Actual behavior

Exception occurs and chat pipeline fails

Regression?

No response

Known Workarounds

none

Configuration

Windows 11 machine:

• .NET 10 - 10.0.103
• Tried in Firefox and chrome - both fail

Oracle Linux Node:

• .NET 10 - 10.0.100
• Tried in Firefox and chrome - both fail (using ssh port forwarding)

Other information

Tried upgrading nuget packages - no changes

[muratbaseren]

Hi,

Chat.razor

    protected override void OnInitialized()
    {
        statefulMessageCount = 0;
        messages.Add(new(ChatRole.System, SystemPrompt));
        chatOptions.Tools = [
            AIFunctionFactory.Create(LoadDocumentsAsync),
            // AIFunctionFactory.Create(SearchAsync)       <-- it causes an error.
        ];
    }

The problem is caused by the Search Tool. In the OnInitialized method of chat.razor, the following line in the chatOptions.Tools settings is causing the error. I think the Search tool is having a JSON serialization issue. Removing this tool eliminates the error, but of course, it also loses the ability to search in the document. There's no problem with creating the vector database. If you comment out the Search tool, the vector database is created.

[ntark]

@muratbaseren Thanks for that hint.
It seems problem is nullable string type for filenameFilter

extensions/src/ProjectTemplates/Microsoft.Extensions.AI.Templates/templates/AIChatWeb-CSharp/AIChatWeb-CSharp.Web/Components/Pages/Chat/Chat.razor

Line 124 in f85ef9c

[Description("If possible, specify the filename to search that file only. If not provided or empty, the search includes all files.")] string? filenameFilter = null)

as that shows up as "type": ["null", "string"] on OpenAPI, while OllamaSharp's mapper expects "type": "string"

[stephentoub]

awaescher/OllamaSharp#376 should address this in OllamaSharp