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I started mininet and gave commands

*** Creating network
*** Adding controller
*** Adding hosts:
h1 h2 h3 h4
*** Adding switches:
*** Adding links:
(h1, s1) (h2, s1) (h3, s1) (h4, s1)
*** Configuring hosts
h1 h2 h3 h4
*** Starting controller
Cannot find required executable controller.
Please make sure that it is installed and available in your $PATH:

I tried to rectify it but can't.

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