An internal error occurred during: "Launching Project". java.lang.NullPointerException
If anyone face this problem, first keep in mind that error is not in your code but due to some internal issue in eclipse ADT. I don't know exact problem but luckily found way to solve it. If you ever encounter this error follow steps below:
- Exit Eclipse.
- Go to Android workspace.
- Locate .metadata folder(make sure you set hidden folder visibility on).
- Delete .metedata folder.
- Start Eclipse(you will notice project explorer is empty, don't panic) and import all your projects.