I have this Add On on Opera too (on a Linux box), but used it longer time not. The last time it had problems because code changes at the tables. I’m sure it can not run without making changes on it. We had it on end of the other thread. My changes help.
You can download the Zip-file, make the changes on it and look how to install an Add On on Opera. Madhof wrote this here, but for Chrome and in french language (lol):