If KRNL-Injector failed to find the Roblox process, delete KRNL App data and see. If that doesn't help follow the solutions mentioned in this post to resolve the issue.

Roblox Find The Markers tasks its players with finding over 200 markers that are well hidden in the game. One such marker, in particular, is … which is pretty hard to find unless you know its ...

Uninstall Roblox: Go to Settings > Apps > Apps & Features, find Roblox, and select Uninstall. Restart: Restart your device. Reinstall: Open the Microsoft Store, search for Roblox, and reinstall it.

Fix #3: Update Roblox installation files. If Roblox is still showing the same crash error, the final solution that you can try is to update certain files in the installation folder.