HTTP ERROR 500

hi i am trying to use facebook pluging with mautic , when i click on the (authaurize button ) i got z pop up :

impossible to treat this page rihght now : HTTP ERROR 500

hi i am trying to use facebook pluging with mautic , when i click on the (authaurize button ) i got z pop up :
impossible to treat this page rihght now : HTTP ERROR 500

Go to Settings -> System Info -> Log and post the errors in this thread.