Android Eclipse Error "Android Packaging Problem"

Question

I am getting an error in my Problems tab for my Android Project in Eclipse. The error is "Android Packaging Problem" with an Unknown location.

Unknown Error NullPointerException

I cannot determine what this problem is. My project was working a few hours ago. The only change I made was to add a public interface ITrackDao to my project and implement it. There are no errors associated with this.

I am not even sure where to begin to look. I cannot launch the application. Can someone give me an idea on what area I can look into? Thanks Peter

Answer 1

I was confronted with this problem too, and I solve it by clicking Menu->Project->Clean. The error goes away after cleaning the project.

Answer 2

I had a similar error - but instead of a NullPointerException it was an InvalidoperationException from somewhere in Eclipse.

A Project > Clean solved that one too.