Getting the error for glass 5.13 dependency resolution

[sunilsaher]

Line 22: {
Line 23: var resolver = GlassMapperScCustom.CreateResolver();
Line 24: base.CreateResolver(resolver);
Line 25: return resolver;
Line 26: }

[NullReferenceException: Object reference not set to an instance of an object.]
Glass.Mapper.Sc.Pipelines.CreateResolver.CreateResolverPipeline.Run(CreateResolverPipelineArgs args) in C:\TeamCity\buildAgent\work\9693a2d38f55a4a\Source\Glass.Mapper.Sc\Pipelines\CreateResolver\CreateResolverPipeline.cs:15
Glass.Mapper.Sc.Pipelines.Initialize.GlassMapperSc.CreateResolver(IDependencyResolver resolver) in C:\TeamCity\buildAgent\work\9693a2d38f55a4a\Source\Glass.Mapper.Sc\Pipelines\Initialize\GlassMapperSc.cs:58
Mercer.Belong.Foundation.GlassORM.App_Start.GlassMapperSc.CreateResolver() in D:\BelongSitecore9\src\Foundation\GlassORM\Mercer.Belong.Foundation.GlassORM\App_Start\GlassMapperSc.cs:24
Glass.Mapper.Sc.Pipelines.Initialize.GlassMapperSc.Start(String contextName) in C:\TeamCity\buildAgent\work\9693a2d38f55a4a\Source\Glass.Mapper.Sc\Pipelines\Initialize\GlassMapperSc.cs:33
(Object , Object ) +13
Sitecore.Pipelines.CorePipeline.Run(PipelineArgs args) +483
Sitecore.Pipelines.DefaultCorePipelineManager.Run(String pipelineName, PipelineArgs args, String pipelineDomain, Boolean failIfNotExists) +235
Sitecore.Pipelines.DefaultCorePipelineManager.Run(String pipelineName, PipelineArgs args, String pipelineDomain) +21
Sitecore.Nexus.Web.HttpModule.Application_Start() +160
Sitecore.Nexus.Web.HttpModule.Init(HttpApplication app) +766
System.Web.HttpApplication.RegisterEventSubscriptionsWithIIS(IntPtr appContext, HttpContext context, MethodInfo[] handlers) +580
System.Web.HttpApplication.InitSpecial(HttpApplicationState state, MethodInfo[] handlers, IntPtr appContext, HttpContext context) +167
System.Web.HttpApplicationFactory.GetSpecialApplicationInstance(IntPtr appContext, HttpContext context) +276
System.Web.Hosting.PipelineRuntime.InitializeApplication(IntPtr appContext) +368

[HttpException (0x80004005): Object reference not set to an instance of an object.]
System.Web.HttpRuntime.FirstRequestInit(HttpContext context) +532
System.Web.HttpRuntime.EnsureFirstRequestInit(HttpContext context) +111
System.Web.HttpRuntime.ProcessRequestNotificationPrivate(IIS7WorkerRequest wr, HttpContext context) +714