Hey panni! There is a new version out, please try that one. If you still have any issues, please create a new thread in our shining new community plugin subspace: http://community.igniterealtime.org/community/plugins/gojara
(this thread is getting a little confusing with all the different content in it)
Please also have a look at the Gajim section in the Guide document.
best regards, Axel