Thanks for your reply Shany,
Unfortunately is not possible for me to share the model given the fact that includes my client's information. I apologize for not making easy your help.
Via technical support I receive the advice to use the MEMORY command, although I described I already used it, now I have a new error.
If I describe my model is:
2914 Nodes
6552 Beams
--------------------------------
46 Load cases
24 Load cases using the command NOTIONAL LOAD.
165 Load cases using the command REPEAT LOAD.
TOTAL: 84 LOAD CASES
--------------------------------
984 LOAD COMBINATIONS
--------------------------------
PERFORM ANALYSIS
CHECK CODE AISC UNIFIED 2005
SELECT .....
GROUP ...
PERFORM ANALYSIS
SELECT ...
GROUP ...
PERFORM ANALYSIS
CHECK CODE
--------------------------------
Now another error appeared, please find it attached. Thanks againg for your attention.
