Here is a list of common errors:
Cannot see the Harmonic indices:
Restart your computer to reload the libraries.
All the results in the Harmonic analysis are zeros:
Make sure the pressures were mapped correctly.
Ensure that Delete Unneeded Files is set to No in the Analysis settings of the Static, Modal, and Harmonic systems.
Ensure that Mistuning and Aerocoupling are defined correctly.
License error-read only fields:
Try closing and opening the Mechanical window.