So, when i launch my game, the program says "Failed to replace the icon".
When it launches the icon is a white square?
I've reinstalled GM several times and it's still hapenning!

Did you try (re)selecting the game icon in Global Game Settings?

NVM, fixed it!

for future reference, you should probably show how you fixed it

That's a bug, which happens when you use a GM decomplier. ( ͡° ͜ʖ ͡°)
EDIT: Ninja'd. Replacing the icon is the solution.

I don't use decompilers m8
Replacing the icon did work though, thanks

I am experiencing the same problem, but simply reselecting the icon doesn't work for me (not even the default Game Maker icon works anymore). Sometimes when I run the game, it works fine, and sometimes it gives this error. Does anyone know how to fix this? (By the way: no, I'm not using a decompiler)