Hello,

Please update the wordnet database files to version 3.1.

Wordnet 3.1 is not a full package as version 3.0. However, the files in the
database directory of version 3.0 can be replaced with those files of version
3.1 and the WordNet interface will run, returning entries from the 3.1
database.

Please see the section on version 3.1 upstream:
https://wordnet.princeton.edu/download/current-version

Best,
Amr