How to fix err "Can't set headers after they are sent."

How to fix err "Can't set headers after they are sent." 

fn = function () { throw arg; };                           ^

Error: Can't set headers after they are sent.
    at ServerResponse.OutgoingMessage.setHeader (_http_outgoing.js:356:11)

How to fix err "Can't set headers after they are sent."

I think you catch this err because you have more than one reponse on your request. Let check it.

Good luck!!!

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