RobotStudio event

Event Message 38209

I have 1 servo gun hooked up to M7.  We plan to only use M7 only. I am starting this robot up for the first time.  I have tried to switch between M7 and M8 with the same problem.  it is pointing to node 7,board 1,link 1, SrvGun1 as the problem area.  Can you please direct me in the proper direction to correct this.
 

Thanks