Process exited before completing request error when testing a function in AWS Lambda

After completing the AWS Lambda tutorial for creating thumbnails, I decided to try and tweak the code to check if a file was a jpg or csv file and if it was simply move it to a new bucket. The only things I removed from my code were the comments and the function within the async.waterfall that would resize images. However, whenever I test or run this new code, I get "process exited before completing request" and the function does not transfer the files correctly. Here is the code:

var async = require('async');
var AWS = require('aws-sdk');
var gm = require('gm')
            .subClass({ imageMagick: true }); // Enable ImageMagick integration.
var util = require('util');






var s3 = new AWS.S3();

exports.handler = function(event, context) {

    console.log("Reading options from event:\n", util.inspect(event, {depth: 5}));
    var srcBucket = event.Records[0].s3.bucket.name;

    var srcKey    =
    decodeURIComponent(event.Records[0].s3.object.key.replace(/\+/g, " "));  
    var dstBucket = 'datacollectionbucket';
    var dstKey    = srcKey;


    if (srcBucket == dstBucket) {
        console.error("Destination bucket must not match source bucket.");
        return;
    }


    var typeMatch = srcKey.match(/\.([^.]*)$/);
    if (!typeMatch) {
        console.error('unable to infer file type for key ' + srcKey);
        return;
    }
    var imageType = typeMatch[1];
    if (imageType != "jpg" && imageType != "csv") {
        console.log('skipping unrecognized file ' + srcKey);
        return;
    }


    async.waterfall([
        function download(next) {
            s3.getObject({
                    Bucket: srcBucket,
                    Key: srcKey
                },
                next);

        function upload(contentType, data, next) {

            s3.putObject({
                    Bucket: dstBucket,
                    Key: dstKey,
                    Body: data,
                    ContentType: contentType
                },
                next);
            }
        ], function (err) {
            if (err) {
                console.error(
                    'Unable to resize ' + srcBucket + '/' + srcKey +
                    ' and upload to ' + dstBucket + '/' + dstKey +
                    ' due to an error: ' + err
                );
            } else {
                console.log(
                    'Successfully classified ' + srcBucket + '/' + srcKey +
                    ' and uploaded to ' + dstBucket + '/' + dstKey
                );
            }

            context.done();
        }
    );
};

Thanks guys