Different Facebook accounts Objective-C - objective-c

I just start the integration of Facebook on my Iphone app.
I can log and get my profile picture and my name, but when i try to switch for another account (not my developer account), i get this error :
FBLoginView encountered an error=Error Domain=com.facebook.sdk Code=2 "The operation couldn’t be completed. (com.facebook.sdk error 2.)"
i obviously already search on internet but don't find any solution, so I really don't know how to fix that :/
thx for your help !
[EDIT] : In fact, my app on the Facebook developer account was in 'SandBox mode' so, only developers and testers could launch this app on their iPhone !!

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