EDIT : pywallet complains if the wallet version is > 81000
Any chance that the wallet is created by the later versions of Bitcoin Core?
Because if so, pywallet doesn't support "
descriptor" wallet.dat which is the new default.
$ ./pywallet.py --version
./pywallet.py:22: UserWarning: Python 3 support is still experimental, you may encounter bugs
version says pywallet.py 1.1
(or is it 22?)
Version is '1.1'
The number '22' belongs to the error message.