Need help fixing Alexa Skill (urgent!) : Now getting an error in js.do that reads "ReferenceError: Can't find variable:exports on line 22"

Line 22 reads 

"exports.handler = function (event, context) {

When I test it in the service simulator on developer.amazon, it responds "the remote endpoint could not be called, or the response it returned was invalid"

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What does this mean, and what can I do to fix it? By the way, this is not homework! 