fixed dependency problems

Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com>
added comments

Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com>
ObjC: add error object for expression that is missing a )

Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com>