Each project generated in Studio has a SSO active for logging in via you Mendix Userid. Works like a charm in the sandbox, but when run locally like you are doing now, you indeed get this error because your app directly routes you to localhost:8080/openid/login.html.
If you change the url to localhost:8080/login.html then you will see the login screen.
To stop your app going to /openid/login.html:
Thank you for your answer.
another quertions is :
how to “Make sure @MendixSSO.SSOEnabled is set to false”.