如何使用Node.js解决Heroku部署错误？

Question

当我尝试使用this tutorial将网站部署到heroku时，它无法正常工作。它返回以下错误：

internal/modules/cjs/loader.js:670
    throw err;
    ^

Error: Cannot find module '"/Applications/Visual'
    at Function.Module._resolveFilename (internal/modules/cjs/loader.js:668:15)
    at Function.Module._load (internal/modules/cjs/loader.js:591:27)
    at Module.require (internal/modules/cjs/loader.js:723:19)
    at Module._preloadModules (internal/modules/cjs/loader.js:945:12)
    at loadPreloadModules (internal/bootstrap/pre_execution.js:363:5)
    at prepareMainThreadExecution (internal/bootstrap/pre_execution.js:61:3)
    at internal/main/run_main_module.js:11:1