LinkedIn iOS SDK - [invalid.profile.access]. You don't have access to the profile -

i have app uses linkedin signing users in. then, retrieves information users using linkedin ios sdk.

i have 2 users, , b. both of them signed app, 1 app instance each user: instancea user , instanceb user b.

the problem have when try retrieve basic profile information user instanceb, following linkedin error.

{   "errorcode": 0,   "message": "[invalid.profile.access]. don't have access profile",   "requestid": "blablabla",   "status": 403,   "timestamp": 1443251861968 } 

if use linkedin's sampleapp comes linkedin ios sdk, can information both user , b.

any idea why error occurs , can fix it?

thanks!