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It's already been resolved as per below thread: https://mailman.stanford.edu/pipermail/mininet-discuss/2012-November/001371.html

If you are still facing the same issue, try resolving manually :

sudo apt-get install telnet

Then:

netstat -nl | grep 6653

If 6653 is in the list, then kill the controller you have running.
If the above command doesn't show any controller instance running,

sudo killall ovs-controller

OR,
Clean the mininet instances,

sudo mn -c