ID:22021 Project "<file name>" is already open in another instance of the Quartus Prime software. Opening more than one instance of a project can cause design conflicts. Do you still want to open the project?

CAUSE: The specified project is already open in another instance of the Quartus Prime software. Opening more than one instance of a project can cause design conflicts.

ACTION: Click Yes to open a second instance of the project; click No to discontinue opening the second instance of the project.