Warn-Message after a few hours

Hi,

i’ve installed Openfire (with Broadcast, IM Gateway, Monitoring and Presence Service, Red5, Registration, Search and User Service) under Debian Lenny (32-Bit) with an external MySQL DB and Java version “1.6.0_12”.

After ~3 days the memory consumption rises from ~60MB up to the memory limit. During this time, warn.log show the following error message:

2009.05.28 14:05:42 Unable to convert from protocolUserMode, falling back to unknown.
2009.05.28 14:05:42 Unable to convert from protocolUserMode, falling back to unknown.
2009.05.28 14:05:44 Unable to convert from protocolUserMode, falling back to unknown.
2009.05.28 14:05:46 Unable to convert from protocolUserMode, falling back to unknown.

Does someone have an idea, what causes the error message? The error- and info.log unfortunately gives no information to the problem.