Error with transfer function in Simmechanics

Hello,

I would like to use in my SimMechanics simulation a transfer function as input for an joint. Unfortunately, I always get the error: Derivative of state 'x6_DOF_Joint.Px.v' in block 'Simulation/6-DOF Joint' at time 0.0 is not finite. The simulation will be stopped. There may be a singularity in the solution. If not, try reducing the step size (either by reducing the fixed step size or by tightening the error tolerances)

State Target is zero. I also tried the PS Integrator and switched to LineSearch-based algorithm. But this did not worked for the Simulink transfer function.

Any Idea?