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Error at G.S.Analysis: singularity detected..(pivot too small).. Help

Error at G.S.Analysis: singularity detected..(pivot too small).. Help

Error at G.S.Analysis: singularity detected..(pivot too small).. Help

(OP)
So I'm running GSAnalysis on a mesh with 8 different surface parts joined by spot weld connections.
When computing the analysis I end up with this error:

Factorized matrix computation.
Singularity detected in rotation (pivot too small)
Possible reasons: missing restraint or connection specifications.
Display rotational vectors to diagnostic the problem.

I'm not sure how to solve this. If anyone has experienced this before please help me.

I did an analysis on a more simple model with 3 rectangular surfaces (2 spot welds) and it worked with no problems.
Then I removed one of the spot weld connections and I got the same error as mentioned.

I guess this means there's a part not connected to the others in the original model and that's why I get this error.
I just can't find this part and would appreciate any tips on how to do it.

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