Krnl doesn't execute scripts

If you are using the roblox pc app then try launching from browser and then injecting and executing otherwise idk what you should do. 

If it does not execute any scripts, check to see if you did not teleport in game. When you teleport, the lua state changes. You would have to reload the scheduler, or datamodel.

If you are a complete noob, did you teleport or something? Did you kill roblox?

Open Command Prompt (or run) and execute this bat script:

taskkill /f /im robloxplayerbeta.exe /t

Sometimes, roblox likes to hide in task manager but won't show up.