S1121

Cause 1: User is not authorized to use Nastran software due to an account synchronization problem.

Action 1: To diagnose if the problem is with the account, perform the following steps:

1. Go to https://manage.autodesk.com. Log in if necessary.
2. Go to "All Products & Services".
3. Search for Nastran.
4. If Inventor Nastran is not listed as an available product, the problem is the assets and contract information needs to be synchronized for the account.
   • Create a support case.
   • Provide the email address of the user.
   • Indicate in the notes that Inventor Nastran is missing from the account.

Cause 2: Running multiple analyses at the same time.

Action 2: Network licenses require one license (one seat) for each analysis, whether on the same computer or separate computers. Run the analyses one at a time.

Cause 3: Corrupt network license file.

Action 3: Create a new network license file.

Cause 4: Dialog with "no Qt platform plugin could be initialized" also appears during analysis.

Action 4: See Fatal error S1121 and "no Qt platform plugin could be initialized" when running Nastran analysis.