ID:251000 Do you want to save changes to the assignments?

CAUSE: You attempted to close the Assignment Editor or initiate another process in the Quartus Prime software, but you did not save the changes you made to the assignments in the Assignment Editor. The Quartus Prime software is asking if you want to save the changes before continuing.

ACTION: Click Yes to save the changes and continue working in the Quartus Prime software, click No to discard the changes and continue working in the Quartus Prime software, or click Cancel to return to the Assignment Editor without saving or discarding the changes.