Answer:
You have generated member loads using the Generate Member Loads from Area Loads via Plane function. You have probably deleted only one area load plane, not all the area load planes.
In our example, we have defined three individual area load planes.
There are two options for deleting area load planes. You can delete either the current area load plane or all area load planes.
If you delete only the current area load plane, you can still select the other two remaining area load planes in the drop-down list. You can tell that all area load planes have been deleted when the Delete All Area Load Planes button is grayed out.
