I've just installed knights 0.6 (with gnuchess). I can't play it. It runs but nothing happens :


There are many errors:
Code:
knights: ERROR: : couldn't create slave : Unable to create io-slave:
klauncher said: Unknown protocol 'tar'.
knights:
knights: WARNING: The theme KBDefault.tar.gz does not exist in any valid path.
knights: ERROR: : couldn't create slave : Unable to create io-slave:
klauncher said: Unknown protocol 'tar'.
knights:
knights: ERROR: : couldn't create slave : Unable to create io-slave:
klauncher said: Unknown protocol 'tar'.
knights:
knights: ERROR: : couldn't create slave : Unable to create io-slave:
klauncher said: Unknown protocol 'tar'.
knights:
knights: WARNING: The theme KCDefault.tar.gz does not exist in any valid path.
knights: ERROR: : couldn't create slave : Unable to create io-slave:
klauncher said: Unknown protocol 'tar'.
knights:
knights: ERROR: : couldn't create slave : Unable to create io-slave:
klauncher said: Unknown protocol 'tar'.
knights:
knights: ERROR: : couldn't create slave : Unable to create io-slave:
klauncher said: Unknown protocol 'tar'.
knights:
knights: WARNING: The theme KSDefault.tar.gz does not exist in any valid path.
QFile::open: No file name specified
QFile::open: No file name specified
QFile::open: No file name specified
QFile::open: No file name specified
QFile::open: No file name specified
QFile::open: No file name specified
QFile::open: No file name specified
QFile::open: No file name specified
QMetaObject::findSignal:io_engine: Conflict with io_base::sendCMD(const Command&)
How can i fix it?