Why Are Some Sheets in Revit Not Loadable?

Sheet or Drafting View is not loadable due to non-loadable elements

Sheets in Revit may not be loadable because they contain model-specific elements on the sheet (plans, sections, elevations, 3d views, legends).

At this time, Revit is not able to load sheets with those types of elements on them.

Solution: Removing those elements from the sheet should allow them to be loadable.

                     Not Loadable Sheets