Vicidial Server not able to take agent in conference

Hello all
When my user logged in to http://192.168.1.5/agc/vicidial.php
it gave me error Noone in th session 8600051
when I check Asterisk on CLI, got following error.
May 1 14:33:33 WARNING[12790]: channel.c:2621 ast_request: No channel type registered for ''
May 1 14:33:33 NOTICE[12790]: channel.c:2514 __ast_request_and_dial: Unable to request channel /1131
Any ideas whats going wrong at my end. one thing I am in doubt that there is forward slash / before extension number to be connected. but have no idea where I did mistake.
will be very much thank full to you for kind help
Thanks in advance
Sani
When my user logged in to http://192.168.1.5/agc/vicidial.php
it gave me error Noone in th session 8600051
when I check Asterisk on CLI, got following error.
May 1 14:33:33 WARNING[12790]: channel.c:2621 ast_request: No channel type registered for ''
May 1 14:33:33 NOTICE[12790]: channel.c:2514 __ast_request_and_dial: Unable to request channel /1131
Any ideas whats going wrong at my end. one thing I am in doubt that there is forward slash / before extension number to be connected. but have no idea where I did mistake.
will be very much thank full to you for kind help
Thanks in advance
Sani