I am getting a weird fatal error while performing Normal Mode Analysis. I am unable to attach .f06 file since it is bulky. Firstly, it had a user action required "DIAG 44" after that some other fatal error with same code which I cannot comprehend.
This sounds like error 4276.2. However, it may be related to running out of disk space.
To find more details about NX Nastran errors, go select the Femap Help > NX Nastran. Select the link for Error List in your browser page.