Are you by any chance deploying an application at about the time you get this error? If so, and if it takes more than a millisecond or 2 to copy the app, then there is a good chance that the hot deployer will attempt to deploy the application before it is fully copied, resulting in the error that you noticed. One way to avoid this problem is to copy your app to a temporary directory on the same disk partition as the app server, and then move the app to the deploy directory.
If you are not making use of hot deployment, you can always turn it off.
As always I copied the new ear file with '#' suffix. Then I renamed the file removing the '#' character.
This could be the reason ?
Anyway do you know how to stop this error without restart jboss ?
It could be. My copy and then move suggestion should prevent the error.