How to fix: VirtualBox Callee RC: NS_ERROR_FACTORY_NOT_

Question :

How to fix: VirtualBox Callee RC: NS_ERROR_FACTORY_NOT_REGISTRED

Answer:

remove   tmp   vbox  files  under tmp   and  (dot)vbox-usernames    directory

rm -rf    /tmp/.vbox*

This  method  was  tested  under   Fedora 14  and  Opensuse 11.3 and  11.4 and it was  working fine