My Kate app not showing in Activities, Favourites,Dock as icon.

It seems like you're facing an issue with your Kate app, where it's not appearing in Activities, Favorites, or the Dock as an icon. The error messages you provided suggest there might be some problems with the Gnome session and the interaction with your app. Here are some steps you could consider to troubleshoot this issue:

Restart the Computer: Sometimes, a simple restart can resolve such issues.

Check Kate Configuration: Ensure that Kate is properly configured within your system settings. It might have been inadvertently removed from your preferred options.

Update or Reinstall Kate: If the issue persists, updating or reinstalling Kate might help resolve any software-related problems.

Check for System Updates: Make sure your operating system and the Gnome desktop environment are up-to-date. Sometimes, system updates can fix compatibility issues.

Review Log Files: The error messages you provided may have corresponding log files that could provide more detailed information. Check your system logs for additional clues on the issue.

Contact Support: If the problem persists and you can't find a solution, consider reaching out to Kate app support or your system administrator for further assistance.

Troubleshooting such issues can sometimes be complex, so if you need further guidance, it's a good idea to involve the experts or support teams who can provide more specific assistance.