Error Streaming Response: Cannot read properties of undefined (reading 'model')

[justinkulang]

Before opening, please confirm:

• I have searched for duplicate or closed issues

Operating System

Windows 11

Kiro Version

v0.4.0

Bug Description

Description:
While attempting to stream a response in Kiro IDE, the following error occurs:

Error streaming response: Cannot read properties of undefined (reading 'model')

It appears that the model property is being accessed on an undefined object, which prevents the streaming response from completing successfully.

Steps to Reproduce

1- uninstalled and reinstalled Kiro several times
2- rebooted the computer many times
3- uninstalled and removed temporary files, reinstalled
4- opened new project

Expected Behavior

The streaming response should execute normally without any errors, and the model property should be accessed correctly.

Conversation ID

No response

Additional Context

[AnilMaktala]

Hey @justinkulang, Thank you for bringing this to our attention. We're aware of this issue and are currently tracking it #1147.

In the meantime, please try these workarounds to see if they resolve the problem:
Switch models: Try selecting a different model and test the functionality again
Refresh your session: Log out completely and then log back in

Please let me know which solution works for you, or if you continue experiencing issues after trying both options.

[justinkulang]

Hey @AnilMaktala
Thanks for getting back to me, however tried all the suggested methods, still not working hope you will fix the issue ASAP.
Thanks

[awesomerin]

still not working.

my newest version does not allow me to select model

[AnilMaktala]

Hey @justinkulang and @awesomerin, I appreciate you trying those steps, and I'm sorry you're still experiencing issues. we will investigate this issue further.

[KK0571]

I got this Error too, it is 2025 Nov. 5 now

my Kiro version：

[justinkulang]

Update (08/11/2025):

I tried the following steps today, and it successfully resolved the issue for me:

Downloaded the latest version of Kiro.

Uninstalled the existing version.

Deleted the Kiro folder located at:

C:\Users<YourUsername>\AppData\Roaming\Kiro

(I removed the entire folder.)

Installed the newly downloaded version.

After completing these steps, Kiro started working normally again. ✅