Uncaught Error: Could not find module `@ember/application` imported from `web-app/app`

What might be the reason for this error?

Please can anyone help? This is how my app-boot.js looks

      if (!runningTests) {
        require("web-app/app")["default"].create({"name":"web-app","version":"0.0.0+9380b4bc"});
      }
    

I have been upgrading my ember version. My whole app is stuck