Invalid token 'while' in class, struct, or interface member declaration in very simple code

Question

I am not sure what the problem is but I keep receiving this error when I try to use a while statement in my code.

Invalid token \'while\' in class,

Answer 1

There's nothing wrong with the while, it's something above it that's the problem. Check for mismatched braces and semicolons in a comment or something like that.