During an analysis run, FEMAP will monitor NX Nastran's output file (.f06), solution info (.f04) and the regular log file (.log). It appears here that the software cannot open the file for reading, do you have Read/Write permission for the C:\Femapv1021\examples directory?
There is one other thing to check, during installation, one must create a scratch directory for NX Nastran to use. In the file c:\Femapv1021\nastran\conf\nast7.rcf, the control file for Nastran, you will see a line that tells NX Nastran where the scratch directory is, on my machine, it's
Please look in this file and see where NX Nastran is looking for scratch space, make sure that directory exists, and that you have read/write permission. For anyone reading this that has installed the usual v10.3 that comes with the 45-day trial, this description is similar, but v10.3 uses NX Nastran v8, so the .rcf file would be -