Does an undefined symbol from a vtable imply an error between interface and implementation?

Question

Does this kind of error implicate an error between an interface and its implementation?

Undefined symbols for architecture i386:
  "MyClass::ChangeManager::GetChanges(
       MyClass::ObjectId, 
       MyClass::IChangeManager::Changes&, 
       bool)"
  , referenced from:
  vtable for MyClass::ChangeManager in libMobileUtils.a(ChangeManager.o)

Answer 1

No. That simply means that when the implementation emitted the vtable, it chose to place that function in it. It's just a plain old undefined function.