SQLException like archiver error. Connect internal only, until freed

can any one give me an idea regarding this below error:

2011-02-11 05:48:42,858 
  -[c=STATS_VITALS] Error running system monitor for开发者_JAVA百科 connectionCloseTime: 
  java.sql.SQLException: ORA-00257: archiver error. 
  Connect internal only, until freed.
java.sql.SQLException: ORA-00257: archiver error. 
  Connect internal only, until freed.

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This usually occurs when the system encounters an error while trying to archive a redo log. Was this working previously and it just failed now for the first time, or is this a new installation? Do you know where your logs are being archived? If so, check to see if that location is out of space as a first step. Once you have more information we might be able to help you a little more effectively.