For a step-by-step walkthrough on fixing genuine login and authentication errors in the Minecraft launcher:
If you are seeing a code like 137 , it often means your system ran out of memory (Out of Memory) and terminated the process. minecraft error 437 download
A mysterious window appears asking if you want to "play Minecraft for the last time." For a step-by-step walkthrough on fixing genuine login
Minecraft Error 437: Between Creepypastas and Download Fixes minecraft error 437 download