from time to time you'll update the andengine.jar and things in your project will start showing quite some errors. Don't worry...
Usually the reason for this is:
- a class was moved
- a class/method has been changed/renamed
Fixing '1.' is the easiest. All you need to do is "Optimize imports..."(CTRL + SHIFT + O) on your src folder
Fixing '2.' just takes a little more time. Methods/Classes (usually) don't disappear, their names/parameters tend to be adjusted. Have a look at similar named Methods and Classes (Eclipse AutoCompletion is your friend!!) and also you shouldn't miss the the List of Changes .
If everything fails, don't hesitate to drop a topic here in the forums.