Admob 6.4.1 is not the latest version of the SDK.
You you now be using Admob from the Google Play Services SDK. Try that instead.
Question
I'm trying to add a Banner and an Interstitials in my app.
I do everything correctly: when i open up the app, i can see on the LogCat that everything is going well(i can see the request been sent), but then it throws this error every time:
04-30 17:00:59.952: D/WebCore(1584): Console: ReferenceError: Can't find variable: JSON line: 172 source: http://media.admob.com/sdk-core-v40.js
04-30 17:00:59.972: D/WebCore(1584): Console: ReferenceError: Can't find variable: AFMA_getSdkConstants line: 1 source: http://media.admob.com/
Solution
Admob 6.4.1 is not the latest version of the SDK.
You you now be using Admob from the Google Play Services SDK. Try that instead.