Forum and assignemtn for course gives accessexception error

Hi, i follow as above all steps and its working for me ,

but while test with below webservice i got permission error

i have added function to all required capability but i am not able to do access below webservice

1)mod_forum_get_forums_by_courses

2)mod_assign_get_assignments

i had set all capability but its gives me error

{
    "exception": "webservice_access_exception",
    "errorcode": "accessexception",
    "message": "Access control exception"
}