Hi @tawanda , you can try the following API to see which data element is not linked:
(you instanceURL)/api/dataElements/tuCkjZMdxS7
Then go to maintenance → program → choose your program, then check if the data element (tuCkjZMdxS7) is assigned to a stage. If not, it should be assigned. It may be assigned to the program but not to the stage which may cause this error.