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// Install the latest version of node
//Run the commands below to update
npm cache clean - f
npm install - g n
Install the latest stable version: n stable
Install the latest release: n latest
The root cause for this error is when the css file is compiled by the css loader more than once. Check if your webpack config has duplicate css loaders entry.
perhaps you imported stylesheet in your index.html and at the same time inside you src/index.js.