josh@Laptop:~$ ntop
Tue Mar  1 11:45:23 2011  NOTE: Interface merge enabled by default
Tue Mar  1 11:45:23 2011  Initializing gdbm databases
Tue Mar  1 11:45:23 2011  **ERROR** ....open of /var/lib/ntop/prefsCache.db failed: File open error
Tue Mar  1 11:45:23 2011  Possible solution: please use '-P <directory>'
Tue Mar  1 11:45:23 2011  **FATAL_ERROR** GDBM open failed, ntop shutting down...
Tue Mar  1 11:45:23 2011  CLEANUP[t3060971456]: ntop caught signal 2
Tue Mar  1 11:45:23 2011  THREADMGMT[t3060971456]: ntop RUNSTATE: SHUTDOWN(7)
Tue Mar  1 11:45:23 2011  CLEANUP[t3060971456] catching thread is unknown
Tue Mar  1 11:45:23 2011  CLEANUP: Running threads
Tue Mar  1 11:45:23 2011  CLEANUP: Locking purge mutex (may block for a little while)
Tue Mar  1 11:45:23 2011  CLEANUP: Locked purge mutex, continuing shutdown
Tue Mar  1 11:45:23 2011  CLEANUP: Continues
Tue Mar  1 11:45:23 2011  PLUGIN_TERM: Unloading plugins (if any)
Tue Mar  1 11:45:23 2011  CLEANUP: Clean up complete
Tue Mar  1 11:45:23 2011  THREADMGMT[t3060971456]: ntop RUNSTATE: TERM(8)
Tue Mar  1 11:45:23 2011  ===================================
Tue Mar  1 11:45:23 2011          ntop is shutdown...
Tue Mar  1 11:45:23 2011  ===================================
josh@Laptop:~$