asterisk users - Jul 2006 - Error on dial_exec_full

Hi list,

I get this message sometimes ( randomly ) when queues are calling agents:

Jul 10 11:26:46 ERROR[8856]: app_dial.c:1481 dial_exec_full: Could not 
stop autoservice on calling channel

I'm trying to see where it comes from ...

Does someone has an idea ???

Thanks in advance !