Facebook Login Fails With Facebook App Installed

I'm new to android development. I've downloaded facebook sdk 3.0.1, and using the sample code to log in. The problem is, that if facebook app is installed the authentication fails.

Solution 1:

Have you setup your debug key hash and full class name on Facebook's app settings dashbaord? see steps 5 and 6 in the Getting Started with the Facebook SDK for Android doc.