android Debug Certificate expired & Unknown Android Packaging Problem

I don’t know if this is good news or bad… good news is that i have been programming android for over 1 year now. Bad news is that your debug certificate expires and then prevents any compilation. Nothing appears in the error window. However you can see it in the problems window.

To solve the problem, check here: http://tutorials-android.blogspot.com/2012/02/solve-debug-certificate-expired-on.html