[Alan Anderson]

Typically a compiler error message is accompanied by the line on which the error was detected. In C/C++, that is sometimes the line after the one with the actual problem. What line is identified as causing each of the errors you see?

You're defining your RobotDrive object as "drivetrain" but you're trying to call the Tank method of something called "drive". I don't know that it's the cause of your compile errors, but it looks suspicious to me.