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I created a new discussion in a group and at the end I get an error 500. Then I go back to the group and noted that the discussion has been created but in trying to get me back out the same error
500 Internal Server Error, please have a look at server error logs for more information.
and it can be 3rd party joomla extension conflict. do you using sh404sef plugins? if yes try to disable it.
FYI: I dont have access to administrator page. i need that for debugging purpose