[...]/textmail/config/express.js:28
    require(controller)(app);
                       ^
TypeError: object is not a function
    at /Volumes/Storage/Repos/Authored/textmail/config/express.js:28:24
    at Array.forEach (native)
    at module.exports (/Volumes/Storage/Repos/Authored/textmail/config/express.js:27:15)
    at Object.<anonymous> (/Volumes/Storage/Repos/Authored/textmail/app.js:18:28)
    at Module._compile (module.js:456:26)
    at Object.Module._extensions..js (module.js:474:10)
    at Module.load (module.js:356:32)
    at Function.Module._load (module.js:312:12)
    at Function.Module.runMain (module.js:497:10)
    at startup (node.js:119:16)