Web Reference: Aug 18, 2015 · Possible reasons are 1. you didn't load React.JS into your page, 2. you loaded it after the above script into your page. Solution is load the JS file before the above shown script. Struggling with the ReferenceError: React is not defined in your project? Learn the common causes and easy fixes to resolve this React error quickly. Improve your React development workflow with our step-by-step troubleshooting guide. Learn how to fix the React is not defined error with this step-by-step guide. Includes causes of the error, common fixes, and code examples.
YouTube Excerpt: main.js:2 ReferenceError: React is not defined at MessagePort.D (main.js:2:219401)
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