Unable to contact the remote controller

When I start running the controller, using sudo ./run.sh -of13 and then start sample configuration with 1 controller, 3 switches, 4 hosts. (In Virtual box VM fedora), I face this error. Could you please let me know the reason behind it. I face this issue frequently, but i don,t know the reason behind it frame a solution.

System COnfig:-
using VM provided by opendaylight, Fedora version.

Controller should be up and running and the topology should be created, but unable to contact the controller.

Attached a screenshot for your easy reference.