title: React and Webpack Issue
body: <p>I have started to build a React App and implemented 3 pages which worked fine.
  After structuring the first page, my app crashed and I am not able to restart it since.</p>
  <p>I don´t know if it has something to do with it but I use Redux as well.</p>
  <p>I tried without the page I created cause I thought maybe I messed up there. But nothing changed. I even rebuilt my app 2 times now without any changes.</p>
  <p>Following errors occur:</p>
  <p><a href="https://i.stack.imgur.com/NpKhT.jpg" rel="nofollow noreferrer">Errors</a></p>
  <p>Folders:</p>
  <p><a href="https://i.stack.imgur.com/ahEWD.png" rel="nofollow noreferrer">My folder structure</a></p>
  <p>Package.json</p>
  <p><a href="https://i.stack.imgur.com/nVLql.png" rel="nofollow noreferrer">My package.json file</a></p>
  <p>However, the backend is running perfectly fine. Issue is just on the frontend.
  I tried multiple tutorials how to fix this but nothing worked</p>
  <p>Thanks for help in advance</p>