SharePoint Online Troubleshooting: Uncaught TypeError: SP.ProxyWebRequestExecutorFactory is not a function

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Environment

Office 365, SharePoint Online, Visual Studio 2015, SharePoint JSOM

Error

Uncaught TypeError: SP.ProxyWebRequestExecutorFactory is not a function

Error occurred at the highlighted line of code below

    hostwebUrl = decodeURIComponent(getQueryStringParameter("SPHostUrl"));

    appwebUrl = decodeURIComponent(getQueryStringParameter("SPAppWebUrl"));

    context = new SP.ClientContext(appwebUrl);

    factory = new SP.ProxyWebRequestExecutorFactory(appwebUrl);

Troubleshooting

According to this MSDN article, SP.ProxyWebRequestExecutorFactory is member of Request Executor(sp.requestexecutor.js). So the script file should be loaded explicitly in the page in order to avoid the error.

Fix

Reference the SP.RequestExecutor.js in the page 

<script type="text/javascript" src="/_layouts/15/SP.RequestExecutor.js"></script>