Trim Condition with SOL144 USER. FATAL MESSAGE 9133 (AESTATRS)

[DomenicoPezzella]

Hello Everyone,

I'm Domenico Pezzella. I'm dealing with my master thesis. I have a problem.
When I set a trim analysis, Nastran told me this Fatal Message:

^^^ USER WARNING MESSAGE 9132 (AESTATRS)
^^^ INITIAL PRBDOFS APPEARS TO BE INVALID.
^^^ NUMBER OF NONZERO TERMS IN PRBDOFS = 6
^^^ NUMBER OF COLUMNS IN TR = 2
^^^ ATTEMPTING AN ALTERNATE METHOD.
^^^ USER FATAL MESSAGE 9133 (AESTATRS)
^^^ COULD NOT GENERATE A VALID PRBDOFS
^^^ NUMBER OF NONZERO TERMS IN PRBDOFS = 1
^^^ NUMBER OF COLUMNS IN TR = 2

I am not able to find this error in nastran manual and I don't know what's happened.

Does anyone know this error?
Thank you for your help.