Everything was working well untill I moved some code from the main file to a new class, then I had the following error:
error C2011: 'color1' : 'struct' type redefinition
red = green = blue = 0;
color1(float _red, float _green, float _blue)
red = _red;
green = _green;
blue = _blue;
float red, green, blue;
If the compiler says it's redefined, then it probably is.
My psychic debugging skills tell me that you moved the struct from a source file to a header file, and forget the include guards in that header, which is then included multiple times in a source file.
EDIT: As a general rule I generally suggest avoiding leading underscores. In some cases (for example followed by a capital letter) they're reserved for the implementation and it's simplest to just never use leading
_ instead of hoping you remember all the rules.