Copilot Error

[manager-man]

🏷️ Discussion Type

Bug

💬 Feature/Topic Area

Copilot in GitHub

Body

mgt.clearMarks is not a function, ouffff!!!!

[github-actions[bot]]

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[syedsafeer]

Hi @manager-man,
this error usually happens due to a version mismatch or a browser cache issue where the Microsoft Graph Toolkit (mgt) fails to load correctly.

Try these quick fixes:

1. Update your Copilot extension and IDE to the latest version.
2. If you're using it in a browser, try clearing your cache or checking in Incognito mode.
3. Disable any other browser extensions that might be interfering with the UI.

Since you've already labeled it as a Bug, the GitHub team can now investigate why this specific function is failing!

[shubham055555]

This error usually indicates a frontend/runtime mismatch rather than an issue with your code.

mgt.clearMarks is not a function suggests that the Microsoft Graph Toolkit (mgt) object being loaded does not match the expected version where this function exists.

Possible causes

• Partial or failed update of Copilot components
• Cached older JavaScript bundle conflicting with a newer UI
• Browser extension interference
• Temporary regression in the Copilot web app

---

Things you can try

• Hard refresh the page (Ctrl + Shift + R)
• Clear browser cache and cookies for GitHub
• Try in an Incognito/Private window
• Disable browser extensions (especially ad blockers or script modifiers)
• Ensure your browser is up to date

If using an IDE (VS Code / JetBrains):

• Update the Copilot extension
• Reload the IDE window
• Sign out and sign back into Copilot

---

Additional note

Since this is a function-level error (not a function), it strongly points to:

• A version mismatch between loaded scripts, or
• A temporary deployment issue on GitHub’s side

If multiple users experience this, it is likely a platform-side bug that will be resolved without any local changes.

---

If the issue persists, sharing:

• Browser/IDE details
• Exact steps to reproduce

would help the GitHub team investigate faster.