[GeoNetwork-users] Error in rebuilding index

I tried to rebuild the index within Administration, but unfortunately got the following error in "network.log" as shown below. Can any Guru point me what/where to look for this error? Thanks a lot in advance.
2014-11-24 14:14:06,062 INFO [jeeves.request] - HTML Request (from xxx.xxx.xx.xx) : /geonetwork/srv/eng/metadata.admin.index.rebuild
2014-11-24 14:14:06,064 INFO [jeeves.service] - Dispatching : metadata.admin.index.rebuild
2014-11-24 14:14:06,066 ERROR [geonetwork.index] - Rebuilding lucene index
2014-11-24 14:14:07,031 INFO [jeeves.service] - -> dispatching to output for : metadata.admin.index.rebuild
2014-11-24 14:14:07,031 INFO [jeeves.service] - -> writing xml for : metadata.admin.index.rebuild
2014-11-24 14:14:07,033 INFO [jeeves.service] - -> output ended for : metadata.admin.index.rebuild
2014-11-24 14:14:07,033 INFO [jeeves.service] - -> dispatch ended for : metadata.admin.index.rebuild

Sorry. Debug into the java source, and found it was not a real error. It
could be a message printed out for info, probably by another developer, but
wrongly using "Log.error()".

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