Error on macro C_U_G, C_DUDX in parallel
 

My first post!! Here is the annoying problem for me...

I wanna extract p, u, v, w after each timestep, the udf code works fine in serial. But in parallel, whenever to access gradients using macro C_U_G, C_DUDX .etc, an 'received a fatal signal' error displayed.

So, is it possible to get gradients in parallel? And what should I do?

THX A LOT!! GUYS!!