ID:233000 Can't find design entity "<name>"

CAUSE: You attempted to locate the specified design entity, but either the Quartus Prime software cannot locate the entity, or you did not select a file to open. This message can occur if the design entity was removed from the project, or the design was not compiled and therefore the entity is not stored in the project database. The message can also occur if you click Cancel to close the Select one design file dialog box without opening a file.

ACTION: Click OK to close the message dialog box, and either choose a file to open, or analyze and elaborate or compile the design containing the selected entity.