The equations of motion can not be solved at this point because of a
singularity in the Jacobian matrix. This singularity is due to the
equation for FLEX_BODY bi_rod_piston.link_flex ( FLEX_BODY/1 Q7ddot ).
ERROR: The matrix is numerically singular.
WARNING: ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
NOTE: The set of redundant constraints has changed at time = 0.0.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
ERROR: Abnormal termination encountered in Solver.