Bumblebee no more working

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http://chakra-project.org – Months ago i configured correctly bumblebee. Today i was trying to launch optirun something and..bumblebee is no more working!optirun glxspheres [ERROR]The Bumblebee daemon has not been started yet or the socket path /var/run/bumblebee.socket was incorrect. [ERROR]Could not connect to bumblebee daemon - is it running?from google, for example, this,  but i'm not sure about what they suggest.What can i do? (HowTos)