Abaqus error - "the selected primary variable is not available in the current frame" 1

[SofiaB]

Hello,

I'm trying to simulate an experimental contact between a truss and a constraining lateral device due to a vertical load, in ABAQUS. The contact happened because the truss had an imperfection that made it have a little horizontal displacement instead of just vertical. To simulate this in ABAQUS I used connectors with only elastic properties(non-linear) but it doesn't represent an increase in the rigidity of the force-displacement curve in the place where the load(a displacement) was applied.

So I thought about using a friction property in the connectors and also added in the history output the variables CCF3,CRF3,CSF3,CTF3 but after running the job I get this message "the selected primary variable is not available in the current frame" and when I'm going to see the vertical force and displacement at the tip there is only "-1.#IND
". This only happened after adding the friction property.

How can I solve this?

 

[FEA way]

Check the output for 1 direction (CCF1, CRF1, etc.) as that’s the one for which you defined the connector behavior.

 

[SofiaB]

Thank you very much for your help!!