simmechanic -simhydraulic mixing problem

I built a simmechanics model of an excavator arm, the prismatic joints runs well with the Joint Actuators. while when ever I try to use a hydraulic circuit actuation ( any simhydraulic example), the next error appears!!

An error occurred while running the simulation and the simulation was terminated

Mechanical model motion is not completely specified when running in kinematics mode. To be legal in kinematics mode, all independent degrees of freedom must be kinematically actuated. Check joints, constraints, drivers, actuators, and DoFs.