I'm working in Unity 4.6. I'm using Google Mobile Ads Unity Plugin v2.3.1 and Facebook SDK 6.2.2. If I initalize Facebook SDK and after when I try to request interstital ad app crashes. Message is: java.lang.NoCLassDefFoundError: android/os/AsyncTask.
This is happening only on Android 3.1, 3.2 and 4.0.3 - 4.0.4.
Fix this for me so I can use official Google Ads Plugin and Facebook SDK for Unity.