Error code9

T_20827

errorcode9

Suddenly, I couldn't analyze two days ago.

but I can't find the answer

Error Code: 9
Error Description:
Feature not found
Feature: OptiStructFEA
Error Code: 9
Error Description:
[LOCAL] C:/Program Files/Altair/2021-edu/security/altair_lic.dat - (Err: 9) Feature not found
License Path: C:/Program Files/Altair/2021-edu/hwdesktop\security\altair_lic.dat;C:\Program Files\Altair\2021-edu\security\altair_lic.dat;C:/Program Files/Altair/2021-edu/security/altair_lic.dat

==== End of solver screen output ====

==== OptiStruct Job completed ====

Please help me