facebook - FBSDKLoginManager fails with error code - 308 -

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we using fbsdkloginmanager our own ui login facebook. login fails error code 308.

as per docs reason - fbsdkloginbadchallengestring, have searched on internet find out reason have had no luck.

any explanation why error occurs , how resolve it?

the reason had error login , logout code used 2 different instances of fbsdkloginmanager.

see answer here https://stackoverflow.com/a/32659830/4068264

(i not have reputation comments apologies community if response not fall in category of "answer")


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