https://www.ejabberd.im/forum/25371/tracking-roster-and-presence-cause-error en https://www.ejabberd.im/forum/25371/tracking-roster-and-presence-cause-error#comment-66585 <p>That is correct thanks.</p> Fri, 19 Feb 2016 05:36:14 +0000 wmorrison1967@gmail.com comment 66585 at https://www.ejabberd.im https://www.ejabberd.im/forum/25371/tracking-roster-and-presence-cause-error#comment-66573 <p>{undef,[{mod_monitor_roster,rostergetversioningfeature,[[],&lt;&lt;"adminpc"&gt;&gt;],[]}</p> <p>It means that it tried to call the function rostergetversioningfeature with two arguments, but it isn't defined. What you defined accepts three arguments, not two.</p> Mon, 15 Feb 2016 14:40:58 +0000 badlop comment 66573 at https://www.ejabberd.im