The react-scripts package provided by Create React App requires a dependency:

Question

There might be a problem with the project dependency tree. It is likely not a bug in Create React App, but something you need to fix locally.

The react-scripts package p

Answer 1

Make sure you don't have a global webpack package or somewhere higher up the directory structure. In my case, I had it globally installed. Deleting and then running npm install and then npm start worked perfectly.