Prewikka internal error

Hi Together,
 
all the time when we try to delete alerts from the Prewikka - Events - Alterts screen, the deletion process stops unexpectedly and the following error appears:
 
Prewikka internal error
 
Traceback (most recent call last):
  File "/usr/lib/python2.5/site-packages/prewikka/Core.py", line 333, in process
    getattr(view_object, view["handler"])()
  File "/usr/lib/python2.5/site-packages/prewikka/views/alertlisting.py", line 1084, in render
    self._deleteMessages()
  File "/usr/lib/python2.5/site-packages/prewikka/views/messagelisting.py", line 358, in _deleteMessages
    self._deleteMessage(idents)
  File "/usr/lib/python2.5/site-packages/prewikka/views/alertlisting.py", line 713, in _deleteMessage
    self.env.idmef_db.deleteAlert(ident)
  File "/usr/lib/python2.5/site-packages/prewikka/IDMEFDatabase.py", line 429, in deleteAlert
    preludedb_delete_alert_from_list(self._db, list(identlst))
PreludeDBError: Lock wait timeout exceeded; try restarting transaction
 
Any help on this issue would be appreciated.
 
Regards,
 
Heinz
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