Compile error (unless adding extra lines) when multiple files in a single sketch

So, when you compile, you "get a compile error". WHAT error?? The error message gives the exact line number, and character position where the invalid syntax is located, and a detailed explanation of WHAT the error is. But, you didn't bother to GIVE us that complete, detailed error message. It's like calling a mechanic and telling him the "Check Engine" light on your car is on, and asking him to tell you what's wrong with the engine....

Regards,
Ray L.