If you fix the problem that is causing this error message, then everything should work. :-)
But seriously, you have not told us anything about the problem, or the circumstances in which it occurs. Please supply:
* The operation system you are running (name and version)
* The JVM you are running (name and version)
* The version of JBoss AS
* How did you install? Downloaded and unzipped the zipfile (if so, are you running the 'all' or the 'default' configuration). Or ran the JEMS installer (if so, what options did you select)
* What were you doing when the error occurred?
* Post the 10 or so lines in the log before and after the error. (This should be a stack trace)