Hi @sanziana_moldoveanu
I think that "Error - M" does not mean anything. It could be that the message shown in the window is cut off. You may want to open the log file directly from the Mandible_7500_6 Implants v5.ds_data\2 folder to see if there is more information.
Even if the log file is the same as shown in the window, some of the other 6 lines of text shown in your image provide some clues. "Quit: model oversize:" and "The number of matrix entries = 4 billion" sounds like a large model to me.
- Did you change something under the Analysis Parameters?
- Are there other warnings in the output that provide some clues?
- What type of analysis are you performing?
John Holtz, P.E. Global Product Support
Autodesk, Inc. If not provided already, be sure to indicate the version of Inventor Nastran you are using!"The knowledge you seek is at knowledge.autodesk.com" - Confucius 😉