twitter4j => AndroidRuntime(446): java.lang.NoClassDefFoundError: twitter4j.http.AccessToken
Solution 1:
You need to change your Folder name from lib to libs as you have updated ADT 17.
Checkout this Article for in detail information on this topic.
Solution 2:
In case someone is using ADT 18, I did not have a lib folder at all, I was using Project, Properties, Java Build Path, Libraries tab exclusively. To resolve this issue, I created a libs folder within my project, copied my external jars to this folder, and then removed the references in the Libraries tab. The project rebuilt and worked!