Eclipse could not delete error

Question

I\'m working on a project with Eclipse and by now everything was fine, but last time I\'ve tried building it, it returned the error,

\"The project was

Answer 1

What works for me :

1. Close Eclipse.
2. Go to your bin folder and delete all the contents (not the folder itself).
3. Start Eclipse.
4. Clean your project by going to Project -> Clean.
5. Make sure you check Project -> Build automatically.