Calling iframe with net :: ERR_BLOCKED_BY_RESPONSE error

I have an iframe in which I call the login page to an external website and its working .. but when I enter the login credentials of the user inside the iframe. it redirects to user panel and iframe shows nothing and through below error

Refused to display ' https://www.dashboard.externalwebsite.com/ ' in a frame because it set 'X-Frame-Options' to 'sameorigin'.

CSSLogin.aspx: 83 GET https://www.dashboard.externalwebsite.com/ net :: ERR_BLOCKED_BY_RESPONSE