Troubleshooting Call back with VQ Plus trial install

I just installed VQ Plus and tried to configure it just the way the manual instruct me to. Configured on of my test queue to use my new callback queue.

When I call my queue and press 1 to request call back, my number is read up loud to me, I speak my name and get information that I will receive a callback when my number is up in the queue. So far everything is good, but from here nothing happens. When I take a look in the Queue callback report no entry has been made. No pending, no failed and no succeeded calls in the report. How can I trouble shoot this issue?

Best Regards

I have the same problem.
queuecallback start
Starting Queue callback daemon: [ OK ]
[[email protected] init.d]# PHP Fatal error: Class ‘freepbx_DB’ not found in /var/www/html/admin/modules/vqplus/ on line 33

Module Version
Virtual Queue Plus
System Admin