Getting "Undefined reference to vtable for {classname}
I don't have the header file for DualMotorRomeo, but the linker is saying that a destructor has been declared (~DualMotorRomeo()) in the class header, but no destructor has been defined. If you didn't write DualMotorRomeo then the library needs to be updated.

Until then, simply add the following to one of your source files:

DualMotorRomeo::~DualMotorRomeo() {
} // DualMotorRomeo::~DualMotorRomeo()


That will also fix the vtable linker errors - the vtable will be included in the compiled file with this declared in it.