EZ Drummer external midi clock error -- please help

I'm using pro tools 8 LTE and just got my rig setup again after a move to our new house. I am using the Eleven Rack as my current interface. I load ezdrummer into an insert on an instrument track and it loads and I can hear drum sounds when I mouse click on any drum in the kit. I then located one of the bundled samples I would like to use and easily enough drag it on to my drum track, Now when I hit the play button in the transport window and I hear the first beat of the 4 beat sample and then playback stops and a separate error window opens stating that there is an external clock error and to check the clock source or choose a different one. I then check the available external clock sources and have tried the 11R, and the connected Axiom keyboard and every other choice that appears yet all yield the same error result. Can anyone assist me in getting this configured correctly? Thank you in advance. Robert