trying to use [pffacebookUtils logininbackgrounwithreadpermission], but get error about fbinternalutility validatescheme

I’m using

[PFFacebookUtils loginInbackgroundWithReadPermission ... 

to log in my user.

However, I received this error:
Terminating app due to uncaught exception ‘NSInvalidArgumentException’, reason: ‘+[FBSDKInternalUtility validateURLSchemes]: unrecognized selector sent to class 0x10b695e40’

I have looked through all the header files; but I just cannot find a class named as FBSDKInternalUtility. Before the upgrade of Parse 1.7.2 and Facebook SDK v4, my log in system works perfectly.

Please help.


Source: facebook

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