Jak nakonfigurovat ntop?

Dobry den, mam problem s konfiguraci programku ntop. Proradi nekdo? pri pokusu o spusteni mi pise chybovou hlasku:

Fri Dec  1 17:26:13 2006  NOTE: Interface merge enabled by default

Fri Dec  1 17:26:13 2006  Initializing gdbm databases

Fri Dec  1 17:26:13 2006  **ERROR** ....open of /var/lib/ntop/prefsCache.db failed: Can't be writer

Fri Dec  1 17:26:13 2006  Possible solution: please use '-P directory'

Fri Dec  1 17:26:13 2006  **FATAL_ERROR** GDBM open failed, ntop shutting down...

Fri Dec  1 17:26:13 2006  CLEANUP[t3056514752]: ntop caught signal 2

Fri Dec  1 17:26:13 2006  THREADMGMT[t3056514752]: ntop RUNSTATE: SHUTDOWN(7)

Fri Dec  1 17:26:13 2006  CLEANUP[t3056514752] catching thread is MAIN

Fri Dec  1 17:26:13 2006  CLEANUP: Running threads

Fri Dec  1 17:26:13 2006  CLEANUP: Locking purge mutex (may block for a little while)

Fri Dec  1 17:26:13 2006  CLEANUP: Locked purge mutex, continuing shutdown

Fri Dec  1 17:26:13 2006  CLEANUP: Continues

Fri Dec  1 17:26:13 2006  PLUGIN_TERM: Unloading plugins (if any)

Fri Dec  1 17:26:13 2006  CLEANUP: Clean up complete

Fri Dec  1 17:26:13 2006  THREADMGMT[t3056514752]: ntop RUNSTATE: TERM(8)

Fri Dec  1 17:26:13 2006  ===================================

Fri Dec  1 17:26:13 2006          ntop is shutdown...

Fri Dec  1 17:26:13 2006  ===================================

Poradi, prosim, nekdo, jak tento program nastavit? Alespon zaklady... Nejak se v dokumentaci nemuzu vyznat.

PS: Prava k souboru prefsCache.db jsem nastavil (chmod 777 prefsCache.db) a presto to vypisuje tuto chybu...

Dik moc vsem predem!

Dotaz: Jak nakonfigurovat ntop?