No FB access token upon initial Parse FB login - facebook

Question

I am logging into my app using PFFacebookUtils.logInWithPermissions however, the first time I log in the actual login works fine but I get the FB error code = 2500 An active access token must be used to query information about the current user. This results in any graphRequests failing.
If I then recompile the code to the device this error does not occur and all graphRequests work fine. Why is the app not getting an access token upon the first login? Also, if I completely delete the app from the device and reinstall this whole process starts again (error code = 2500 on first attempt).
Also maybe worth noting, this didn't happen with the previous versions of Parse and FB SDKs. I am just starting to move this app into iOS9 and that's when this problem popped up.
Xcode 7.0.1, Parse SDK v1.8.5, FacebookSDKs-iOS-20150910

Answer 1

I was able to resolve this issue by first calling the FBSDK login method followed by the Parse SDK login method (inside the FBSDK callback):
#IBAction func facebookButtonAction(sender: AnyObject) {
// Ensure that PFUser == nil - just in here because I heard it can help with some possible issues
PFUser.logOut()
let permissions = ["public_profile", "email", "user_friends"]
// First, login with FB’s SDK
let login: FBSDKLoginManager = FBSDKLoginManager()
login.logInWithReadPermissions(permissions, handler: {(result: FBSDKLoginManagerLoginResult!, error: NSError!) in
if (error != nil) {
NSLog("Process error")
} else {
if result.isCancelled {
NSLog("Cancelled")
} else {
NSLog("Logged in")
// Then with Parse’s, upon FB login success
PFFacebookUtils.logInWithPermissions(permissions) { (user, error) -> Void in
if let user = user {
if user.isNew {
print("User signed up and logged in through Facebook!”)
//...
} else {
print("User logged in through Facebook!")
//...
}
} else {
print("Uh oh. The user cancelled the Facebook login.")
//...
}
}
}
}
})
}