Older versions than 1.12.2 stopped working!

Every single version except for 1.13 and 1.14, has just magically stopped working. Yesterday it was just fine, until today. I tried adding memory, updating minecraft, removing all mods (including forge), and NONE of my instances worked except for 1.13 and 1.14. Not even the first alpha version of Minecraft. I have tried all of my instances, and I even made a new 1.12.2 instance but it still didn't work. It said "Process exited with code 127", and I don't know what it means. I tried searching it up, but it didn't tell me anything about it. I just had no idea what to do. By the way my computer is ASUS, if maybe it has something to do with the platform I am using. If any of you have an answer, please do let me know, and thank you.