Forum Error

Has anyone seen this error while going to browse their EE forum. I just downloaded the latest forum 3.1.19 and I am running EE 2.9.3. The issue is this message.

Fatal error: Call to undefined method EE_Messages::can_send_pm() in /home/mysite/public_html/system/expressionengine/modules/forum/mod.forum.php on line 1215

Is this a bug? How can I get rid of it?