Error no control surface
 

Hello:
I am new in CFX, I try to study the Pressure wave propagation inside water pipes.
I make now run for unsteady state, and become this Error:
no control surface have been found at all for PulserPositivepulser G1.

To work around this please se expert parameter ggi permit no intersection=t

Could any one help me, how can I make this!!!:confused: