Cannot login through GitHub

Hey,
I'm getting this error:
"
Failed to load https://accapi.appbase.io/user: No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'https://dashboard.appbase.io' is therefore not allowed access.
"
While I'm trying to login, to my account.
I've tried to delete my cookies, also tried incongito, but if it's really problem with http headers, than i can do nothing about that on my side.