Node.js Alexa Task Issue

I'm currently coding a Node.js Alexa Task via AWS Lambda, and I have been trying to code a function that receives information from the OpenWeather API and parses it into a variable called weather. The relevant code is as follows:

var request = require('request');

var weather = "";

function isBadWeather(location) {

      var endpoint = "http://api.openweathermap.org/data/2.5/weather?q=" + location + "&APPID=205283d9c9211b776d3580d5de5d6338";

      var body = "";

      request(endpoint, function (error, response, body) {

            if (!error && response.statusCode == 200) {

                  body = JSON.parse(body);

                  weather = body.weather[0].id;

            }

      });

}



function testWeather()

{

      setTimeout(function() {

      if (weather >= 200 && weather < 800)

            weather = true;

      else

            weather = false;

      console.log(weather);

      generateResponse(buildSpeechletResponse(weather, true), {});

      }, 500);

}

I ran this snippet countless times in Cloud9 and other IDEs, and it seems to be working flawlessly. However, when I zip it into a package and upload it to AWS Lambda, I get the following error:

{

    "errorMessage": "Cannot find module '/var/task/index'",

    "errorType": "Error",

    "stackTrace": [

        "Function.Module._load (module.js:276:25)",

        "Module.require (module.js:353:17)",

        "require (internal/module.js:12:17)"

    ]

}

I installed module-js, request, and many other Node modules that should make this code run, but nothing seems to fix this issue. Here is my directory, just in case:

- planyr.zip

   - index.js

   - node_modules

   - package.json

Does anyone know what the issue could be?