Karma unit reporter not recognized

Making sure you are running npm install

and that all your plugin dependencies are in your package. json, as @ssube says in the title, is a good place to start. That being said, here's what worked for me:

  module.exports = function (config) {
    config.set({

    // base path that will be used to resolve all patterns (eg. files, exclude)
    basePath: '',

    browsers: ["PhantomJS"],

    frameworks: ["jasmine-jquery" ,"jasmine"],

    files: [
        {
            pattern: "test/**/*.html",
            included: false,
            served: true,
            watched: true
        },
        "dist/latest/phone.min.js",
        "node_modules/jquery/dist/jquery.js"
        {
            pattern: "test/functional/test/phoneTest.js",
            watched: true
        }
    ], plugins: [
        "karma-jasmine-jquery",
        "karma-phantomjs-launcher",
        "karma-junit-reporter",
        "karma-jasmine"
    ],

    client: {
        "captureConsole": true
    },

    phantomjsLauncher: {
        // Have phantomjs exit if a ResourceError is encountered (useful if karma exits without killing phantom) 
        exitOnResourceError: true
    },

    singleRun: true,

    reporters: ['progress', 'junit'],

    junitReporter: {
        outputDir: "testResults",
        outputFile: "FUNCTIONAL-TEST-results.xml"
    }
 });
};