How to fix [CoreError::LAYOUT_ERROR][IError::ComponentLoadError]

Hello @Vinicius Lima de Andrade,

Welcome to the Microsoft Q&A Forum,

Based on the information you have provided, I understand that you are experiencing an issue when opening the Microsoft Teams desktop application (version 26.3.1) on your Mac device.

To help me better understand the problem and provide the most accurate assistance, could you please share the following details:

• Which macOS version and Mac model are you currently using?
• Were you able to use the Teams application normally before this issue occurred?
• Did your Mac receive any recent updates around the time the issue started?
• Are you able to use other Office applications such as Word, Excel, or PowerPoint without any errors?

In the meantime, please try the following steps to see if they help resolve the issue:

1. Clear the Microsoft Teams cache on your Mac

• Open Finder.
• Navigate to /Applications/Utilities, then double‑click Terminal.
• Run the following commands one by one (press Return after each):
  rm -rf ~/Library/Group\ Containers/UBF8T346G9.com.microsoft.teams
  rm -rf ~/Library/Containers/com.microsoft.teams2
• Restart the Teams application.

2. Reinstall Microsoft Teams

If the issue persists, please uninstall and reinstall the Teams application.

Once you have tried the steps above or gathered the requested details, kindly update me so I can continue assisting you.

Thank you, and I look forward to your reply.

The error [CoreError::LAYOUT_ERROR][IError::ComponentLoadError] Slot name: MAIN indicates a Teams client startup/layout problem on macOS. From the provided context, the supported remediation paths for Teams desktop issues on Mac are:

1. Verify OS compatibility
   • Ensure the Mac is running a Teams-supported macOS version. If the OS is unsupported, update macOS to a supported version as required for the Teams client.
   • The guidance for unsupported OS versions is to update to a supported version of macOS before using the new Teams client.
2. Fully remove local Teams data and reinstall
   • On macOS, stale or corrupted local Teams data can cause launch and layout/component errors. The recommended approach is a full cleanup of Teams data followed by reinstall.
   • Steps used successfully in a similar Mac Teams issue:
     1. Quit Microsoft Teams.
     2. Delete Teams’ local data folders:

                rm -rf ~/Library/Group\ Containers/UBF8T346G9.com.microsoft.teams
                rm -rf ~/Library/Containers/com.microsoft.teams2
        

     3. Optionally remove any Teams desktop shortcut.
     4. Reinstall Microsoft Teams for Mac and sign in again.
   • This process cleared a stuck/invalid organization profile and resolved client issues after reinstall.
3. If Teams crashes or closes unexpectedly during/after showing this error
   • Ensure any non-Microsoft antivirus or DLP tools are not blocking Teams or its WebView2-based components, as blocking these can cause client crashes and failures in loading UI components.
   • Include/allow:
     • The Teams desktop client executable
     • The executable that automatically starts Teams
     • Microsoft Edge WebView2 processes
   • If media or UI components are involved in the crash, enabling Windows Error Reporting (WER) is recommended on Windows; on macOS, collect crash logs and contact Microsoft Support.
4. If the issue persists after cleanup and reinstall
   • Confirm network access to required Teams endpoints (firewall/proxy not blocking) if the error appears at initial load.
   • If the problem continues even on a supported macOS version with a clean profile and working network, contact Microsoft Support with:
     • Exact Teams version (26.3.1)
     • macOS version
     • Screenshots/logs of the error

References:

• Resolve Teams client launch failures
• Resolve Teams "client crash" issues
• Resolve issues when starting the new Teams app
• Unable to remove Organization from Teams on my Mac - Microsoft Q&A
• cannot install update in MAC sequoia - Microsoft Q&A
• No Network Connection Please check your network settings and try again. [2604] - Microsoft Q&A