Router issue: failed to load 'null/Page.js' - No 'Access-Control-Allow-Origin'

Hi experts,

after adding router to my project I got the following error

XMLHttpRequest cannot load https://sapui5.hana.ondemand.com/resources/null/Page.js. No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://localhost:62496' is therefore not allowed access. The response had HTTP status code 404.

I have already configured my proxy and it worked before adding router..do you know what am I missing?

Regards,

Filip