play mode error

How come every time i try to go to play mode it's says All compiler errors have to be fixed before you can enter play mode HOW CAN I FIX THAT.

It means exactly what it says: All compiler errors have to be fixed before you can enter play mode. Your scripts have errors, and you can't enter play mode with broken scripts. So, fix all compiler errors. Look at the console, see what the errors are, and fix them.