Following up from my previous post, I believe I have isolated the issue:
Due to an error on my part, if the tables do not exist the plugin does not create them immediately on activation, but after the first run/request. I will fix this.
If you only saw the error once and no more then that means that the tables are created now and you can proceed.
If the error persists, deleting the wallets_db_revision option will do the trick.
With SQL: DELETE FROM wp_options where option_name = 'wallets_db_revision';
Or with cp-cli: wp option delete wallets_db_revision.
Refresh your WordPress and your tables should be created.
Or simply wait until the next patch.
Apologies for the confusion.
regards