Hello Mito,

I opened your model and deleted all the objects that were not essential.  What you are left with is a Y and Z spring to ground at each bearing. That takes away 4 DOF. The X displacement and X rotation on one vertex takes away 2 more DOF to fully constrain the 6 DOF needed for a Static Solution. Ignore the warning that "Not enough constraints appear to be applied..." becuase it is not true.