https://bugzilla.wikimedia.org/show_bug.cgi?id=72669
--- Comment #4 from JAn Dudík jan.dudik@gmail.com --- (In reply to Merlijn van Deen from comment #2)
That statement:
- never has existed in core, as catlib doesn't exist there,
- has been removed in compat in this revision:
https://github.com/wikimedia/pywikibot-compat/commit/ fcaa349e54e7850e555b878d7b9f5aa0b6edbd7c
So you probably copied an ancient revision of compat interwiki.py into d:\py\rewrite or d:\py\rewrite\scripts.
I found duplicate old interwiki.py in the same directory as pwb.py - bot takes this first instead of scripts/interwiki.py
Now I can run script, but some new errors.