RocketNut:
I ran into it with my main project sketch. To check it out I tried to compile the "Blink" sketch and got the same error.
Let's stick with that as it is a short program.
Post the exact error message that the compiler produced when trying the Blink program.
Are you sure you have selected the correct board in the IDE?
Do you get a compiler error if you try to compile for an Uno?
...R