I got an error message when performing the following steps:
git clone ...
npm install
npm run build
npm run start
The npm run start command printed the following error message:
Error: Cannot find module 'webpack-cli/bin/config-yargs'
It seems to be a problem of incompatibility between the webpack, webpack-cli and the webpack-dev-server versions. I downgraded the webpack and webpack-cli and this problem was gone.