iOS 9 “fbauth2” missing from Info.plist
You can continue to use URL schemes when you build your app for iOS 9 and you want to call URL schemes, you will now need to declare them in your apps Info.plist. There is a new key, LSApplicationQueriesSchemes, and here you will need to add the list of schemes you want to are canOpenURL on.
<key>LSApplicationQueriesSchemes</key>
<array>
<string>fbauth2</string>
</array>
As to v4.6.0 of the FaceBook SDK, add the following key into your plist file:
<key>LSApplicationQueriesSchemes</key>
<array>
<string>fbapi</string>
<string>fb-messenger-api</string>
<string>fbauth2</string>
<string>fbshareextension</string>
</array>
Link: https://developers.facebook.com/docs/ios/ios9
If you are using iOS9 then this is important to update your info.plist file. You just need to do 3 steps 1. Go to info.plist 2. Add a field namely LSApplicationQueriesSchemes NSArray datatype. 3. Add an item of NSString datatype name it as fbauth2.
Thats it. Just clean and run. warning wont show again.