Exception: Please shut down the controller which is running on port 6653: Mininet

For following error:

"""

*** Creating network

*** Adding controller

--------------------------------------------------------------------------------

Caught exception. Cleaning up...

Exception: Please shut down the controller which is running on port 6653:

Active Internet connections (servers and established)

tcp        0      0 0.0.0.0:6653            0.0.0.0:*               LISTEN      1828/ovs-testcontro

tcp        0      0 127.0.0.1:42042         127.0.0.1:6653          TIME_WAIT   -                 

--------------------------------------------------------------------------------

*** Removing excess controllers/ofprotocols/ofdatapaths/pings/noxes

killall controller ofprotocol ofdatapath ping nox_core lt-nox_core ovs-openflowd ovs-controller udpbwtest mnexec ivs 2> /dev/null

killall -9 controller ofprotocol ofdatapath ping nox_core lt-nox_core ovs-openflowd ovs-controller udpbwtest mnexec ivs 2> /dev/null

pkill -9 -f "sudo mnexec"

*** Removing junk from /tmp

rm -f /tmp/vconn* /tmp/vlogs* /tmp/*.out /tmp/*.log

*** Removing old X11 tunnels

*** Removing excess kernel datapaths

ps ax | egrep -o 'dp[0-9]+' | sed 's/dp/nl:/'

***  Removing OVS datapaths

ovs-vsctl --timeout=1 list-br

ovs-vsctl --timeout=1 list-br

*** Removing all links of the pattern foo-ethX

ip link show | egrep -o '([-_.[:alnum:]]+-eth[[:digit:]]+)'

ip link show

*** Killing stale mininet node processes

pkill -9 -f mininet:

*** Shutting down stale tunnels

pkill -9 -f Tunnel=Ethernet

pkill -9 -f .ssh/mn

rm -f ~/.ssh/mn/*

*** Cleanup complete.

"""

SoLUTION

~~~~~~~~~

Execute following in terminal:-           sudo fuser -k 6653/tcp

Result:-         6653/tcp:             1828

Explanation:-        Killed the previous controller instance. Now new network can be created in Mininet.