If the message appears it means that you are extremely low in RAM memory: please note this is FEA, not CAD, then RAM memory here is critical.
How to save RAM memory?. Simply, close all programs in execution before running FEMAP, not other trick exist, you can remove & uninstall any other software that could be resident in RAM memory (antivirus, etc..).
Best regards, Blas.
Blas Molero Hidalgo, Ingeniero Industrial, Director IBERISA • 48004 BILBAO (SPAIN) WEB: http://www.iberisa.com Blog Femap-NX Nastran: http://iberisa.wordpress.com/