what is this error?

When I used the new build of corona (2511) I tried to build my app in android and it when successful but when I tried to build it again I started getting this error and again and again.

What error?

Ahh, I see you had a double post, and got an answer from Rob here: http://forums.coronalabs.com/topic/52868-what-is-this-error/

What error?

Ahh, I see you had a double post, and got an answer from Rob here: http://forums.coronalabs.com/topic/52868-what-is-this-error/