SQL & PL/SQL

I registered a custom pl sql block as an Oracle Concurrent Request. I want to raise an EXCEPTION that will make the job end in an ERROR status if a condition is met. How can I do this? Here's an excerpt of the code I have:

EXCEPTION
  	WHEN v_nodata THEN
                <what command can I put here?  I want the concurrent request job to error so that the next pl sql block doesn't get executed.>
 	when OTHERS THEN NULL;
END;
/

Thanks!