Cause
This error occurs when you attempt to compile a method that exists in the current version but not in the latest version and that method refers to a property or method that is different in the latest version; for example, a property with a different type or a method with a different signature.
Action
Extract the method that cannot be compiled from the current version and load it into the latest version. Alternatively, remove references to the property or method that is different in the latest version.