Error: [Argument_AddingDuplicate] when opening the project worksheet

The [Argument_AddingDuplicate] error can occur when the same column has been added twice to a project worksheet view.

The users who have the view as their default view will encounter the error when opening the worksheet. Users who have other views as their default view can open the project worksheet without the error.

If the view with the duplicate columns is a shared view, a user who can access the project worksheet can edit the view to remove the duplicate column.

If the view cannot be fixed by any user, then please open a support ticket to obtain the fix.