Error ionic super starter template

I received the following error when click on “login”:
Failed to load Response to preflight request doesn’t pass access control check: No ‘Access-Control-Allow-Origin’ header is present on the requested resource. Origin ‘http://localhost:8100’ is therefore not allowed access.
After login, the sidemenu also not showing.
Can anyone help me? thx.

Fixed the CORS issue using this solution
but the sidemenu still not showing.