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

just adding to the knowldege base. i've had this problem. restarting eclipse or windows did not fix it.

deleting .metatdata/.lock in the parent directory after closing eclipse did fix the problem. iirc, sometimes you need to reboot windoze.