Facebook Login stopped working for some devices

Hi, I have an IOS app that enables users to login with facebook, it all worked well for some time now, but yesterday it suddenly stopped working for some devices. When I try to login with facebook, instead of seeing the normal facebook login screen inside safari, I see a blank white screen with no buttons on it, so my app is stuck, and I can see in the Xcode' console the error:

[ViewService] Failed to get remote view controller with error: Error: domain=_UIViewServiceInterfaceErrorDomain, code=2.

FBSDKLoginManager *login = [[FBSDKLoginManager alloc] init[;
login.loginBehaviour = FBSDKLoginBehaviorNative;
[login logInWithReadPermissions:@[@"public_profile",@"email",@"user_friends"]
fromViewController:viewController handler:^(FBSDKLoginManagerLoginResult *result, NSError *error)
{
   **Here I receieve the error from above in the error callback**
}];

This error occurs only in specific devices.

Any ideas what could cause this? Again, it used to work and suddenly happen without changing any of the login code.

Thanks, Eitan.

Picok labs.