Hello people

It is my first post and i m not sure if this the right place to post the problem i m facing.Hope the community can help me find a solution.Here it goes

My model describing the motion of a mecahnism inlcludes several submodels.Each submodel checks and simulates successfully. When I combine all of them the final product checks successfully and starts to simulate but I receive the following message at message browser

"Error: Failed to open simulation result C/(input directory) Too few rows in data_2 matrix"

Also the simulation output reads:
Error, singular Jacobian for dynamic state selection at time 0.000000 Use -lv LOG_DSS_JAC to get the Jacobian
Process crashed Simulation process exited with code -1

If I change the initial conditions the Simulation seems to run succesfully but the results show that the simulation run only for 2 steps (0.0005 sec) and the simulation out put reads Process crashed Simulation process exited with code -7

For some initial conditions  no error appears but the simulation never goes more than 0%

1)Any ideas what these error might indicate
2)How do i use the  -lv LOG_DSS_JAC

psMy model consists by two major models:one that describe the kinematic motion of the mechanism(rods and joints mainly) and one that provides actuation of the joints of the mechanism(motors that provide torque)

Thanks in advance