Reply To: ERROR in transient analysis

[dlooman]

It shouldn't be an error if the nodes aren't coincident.  The COMBI14 Assumptions and Restrictions has the bullet item:

• For noncoincident nodes and KEYOPT(2) = 1, 2, or 3, no moment effects are included. That is, if the nodes are offset from the line of action, moment equilibrium may not be satisfied.  

You are using somewhat archaic commands, EN and LSSOLVE.  What version are you running?  RBE3 (force distribution constraint equations) is an unusual way to connect nodes.  CERIG would be a fixed connection.