[Mini-NDN] Error connecting to ovs-db with ovs-vsctl

[Imen Souidene]

Dear Committe , 
Please how can i solved it ?

~$ sudo mn*** Creating network*** Adding controller*** Adding hosts:h1 h2 *** Adding switches:ovs-vsctl: unix:/usr/local/var/run/openvswitch/db.sock: database connection failed (No such file or directory)ovs-vsctl exited with code 1*** Error connecting to ovs-db with ovs-vsctlMake sure that Open vSwitch is installed, that ovsdb-server is running, and that"ovs-vsctl show" works correctly.You may wish to try "service openvswitch-switch start".
Cdt, 
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