Describe the error/difficulties:

The client runs wrong becuse there's no babel or its related dependent packages in your package.json, like @babel/core, babel-loader. It causes errors and interrupted the running process.

What have you done:

I've tried to yarn add these required babel package, but it seems the latest version is not compatible with your project. Then I tried yarn remove these packages, rm -rf package-lock.json node-modules and install a lower version of babel-loader, the problem is still there.

What it supports to do?

Please specify your babel version and add them to your package.json.