Good Morning
I have a question.
I must check the instalation with a lateral Expansion joint with tie rods.
So (axial stiffness) is theoretically rigid.
I give the restarints on tie rods and when I started calculate I have always the same result

FATAL ERROR 257 ??

How solve this isssue

In addition to other causes, this fatal error appears when you provide a model that has insufficient restraint to carry the applied load - often called rigid body motion. A simple example is a single pipe with one end pinned and the other end free under a deadweight load. Conceptually, you will get the free end "spinning around" the pinned end which is no solution using the stiffness method.
My guess? I think you have Node/CNode restraint pairs on both ends of your tie rods. This allows the tie rods themselves to "spin around" their longitudinal axes. We usually fix on end and pin the other to get around this.