abaqus/explicit problem

Dear all,

I performed a simulation of a drop test of a composite material onto a rigid ground in Abaqus Explicit. The composite model is a unidirectional carbon/epoxy laminate and is built with solid elements C3D8 while the ground is modeled with rigid quadrilateral R3D4. I defined a general contact (explicit) in my model with Tangential behavior property. For boundary condition, one reference point at the center of the ground was fixed while all the nodes of the composite model were assigned an original velocity to simulate the drop from a certain height. The composite was placed at a position very close to the surface of the ground.

When I submitted the job, I got the error below and the job was terminated:
"THE PARAMETER COMPOSITE CAN NOT BE USED IN Abaqus/Explicit"