AttributeError: 'AipNlp' object has no attribute 'synthesis'

This error message indicates that the 'AipNlp' object does not have a method or attribute named 'synthesis'. This could be due to a few different reasons:

1. The method or attribute may not actually exist in the 'AipNlp' object. Double-check the documentation or source code to confirm whether this is the case.

2. The method or attribute may be misspelled or capitalized incorrectly. Make sure that the name of the method or attribute is correct and matches the case used in the code.

3. The 'AipNlp' object may not have been instantiated correctly. Check that the object was created and initialized properly before trying to use its methods or attributes.