Abaqus - CICPS in general contact (Explicit)

Hi everyone.

I have the following problem. I have a model in which I'd need to take the total contact force for a surface. To achieve that, I requested CICPS variable for Output History. I used this variable in the past for kinematic contact in Abaqus Standard successfully. But in this model I get this error when I launch the simulation:

"OUTPUT REQUEST CICPS IS NOT AVAILABLE FOR THIS OPTION"

I don't know why. The contact output line seems to be well defined

*Contact Output, surface=Spring-1.Surf-Top
CICPS, 

I have created the model by Abaqus CAE and launch it from it.

Any suggestion?

Thanks in advance