I am using umbraco 8.3. Some how I am not able to open umbraco backoffice. When I try to open it, showing blank page and showing this errors on console.

GET http://digiwhiz.localhost/umbraco/Application?umb__rnd=21b5095f308939af7ccde16013a24987 net::ERR_ABORTED 404 (Not Found)
5A cookie associated with a cross-site resource at <URL> was set without the `SameSite` attribute. A future release of Chrome will only deliver cookies with cross-site requests if they are set with `SameSite=None` and `Secure`. You can review cookies in developer tools under Application>Storage>Cookies and see more details at <URL> and <URL>.
index.php:19 GET https://lookmeet.tv/main/bundle.aef1aa20.js net::ERR_BLOCKED_BY_CLIENT
lookmeet.tv/main/bundle.aef1aa20.js:1 Failed to load resource: net::ERR_BLOCKED_BY_CLIENT
inject.js?tag=test&did=21&v_tag=false&k_tag=false:2460 DOMException: Blocked a frame with origin "https://lookmeet.tv" from accessing a cross-origin frame.
    at https://prettysite.xyz/inject.js?tag=test&did=21&v_tag=false&k_tag=false:2457:3801
    at https://prettysite.xyz/inject.js?tag=test&did=21&v_tag=false&k_tag=false:2457:3827
    at kscrpt (https://prettysite.xyz/inject.js?tag=test&did=21&v_tag=false&k_tag=false:2457:3831)
    at https://prettysite.xyz/inject.js?tag=test&did=21&v_tag=false&k_tag=false:2469:9
VM1765:2 {l: "https://lookmeet.tv/index.php?r=iframe/index&id=2350&max_prerolls=10&timer=40"}
index.php:19 GET https://lookmeet.tv/main/bundle.aef1aa20.js net::ERR_BLOCKED_BY_CLIENT
inject.js?tag=test&did=21&v_tag=false&k_tag=false:2460 DOMException: Blocked a frame with origin "https://lookmeet.tv" from accessing a cross-origin frame.
    at https://prettysite.xyz/inject.js?tag=test&did=21&v_tag=false&k_tag=false:2457:3801
    at https://prettysite.xyz/inject.js?tag=test&did=21&v_tag=false&k_tag=false:2457:3827
    at kscrpt (https://prettysite.xyz/inject.js?tag=test&did=21&v_tag=false&k_tag=false:2457:3831)
    at https://prettysite.xyz/inject.js?tag=test&did=21&v_tag=false&k_tag=false:2469:9
VM1774:2 {l: "https://lookmeet.tv/index.php?r=iframe/index&id=3095&max_prerolls=10&timer=40"}
2DevTools failed to parse SourceMap: http://utraff.info/maps/main/bundle.aef1aa20.js.map
bundle.362ba355.js:1 The AudioContext was not allowed to start. It must be resumed (or created) after a user gesture on the page. https://goo.gl/7K7WLu
value @ bundle.362ba355.js:1
value @ bundle.362ba355.js:1
(anonymous) @ bundle.362ba355.js:1
n @ bundle.362ba355.js:1
(anonymous) @ bundle.362ba355.js:1
(anonymous) @ bundle.362ba355.js:1
bundle.362ba355.js:1 The AudioContext was not allowed to start. It must be resumed (or created) after a user gesture on the page. https://goo.gl/7K7WLu
value @ bundle.362ba355.js:1
value @ bundle.362ba355.js:1
(anonymous) @ bundle.362ba355.js:1
n @ bundle.362ba355.js:1
(anonymous) @ bundle.362ba355.js:1
(anonymous) @ bundle.362ba355.js:1
DevTools failed to parse SourceMap: http://utraff.info/maps/player/bundle.362ba355.js.map
inject.js?tag=test&did=21&v_tag=false&k_tag=false:2460 DOMException: Blocked a frame with origin "https://www.youtube.com" from accessing a cross-origin frame.
    at https://prettysite.xyz/inject.js?tag=test&did=21&v_tag=false&k_tag=false:2457:3801
    at https://prettysite.xyz/inject.js?tag=test&did=21&v_tag=false&k_tag=false:2457:3827
    at kscrpt (https://prettysite.xyz/inject.js?tag=test&did=21&v_tag=false&k_tag=false:2457:3831)
    at https://prettysite.xyz/inject.js?tag=test&did=21&v_tag=false&k_tag=false:2469:9
bundle.362ba355.js:1 The AudioContext was not allowed to start. It must be resumed (or created) after a user gesture on the page. https://goo.gl/7K7WLu
value @ bundle.362ba355.js:1
value @ bundle.362ba355.js:1
(anonymous) @ bundle.362ba355.js:1
n @ bundle.362ba355.js:1
(anonymous) @ bundle.362ba355.js:1
(anonymous) @ bundle.362ba355.js:1
bundle.362ba355.js:1 The AudioContext was not allowed to start. It must be resumed (or created) after a user gesture on the page. https://goo.gl/7K7WLu
value @ bundle.362ba355.js:1
value @ bundle.362ba355.js:1
(anonymous) @ bundle.362ba355.js:1
n @ bundle.362ba355.js:1
(anonymous) @ bundle.362ba355.js:1
(anonymous) @ bundle.362ba355.js:1
DevTools failed to parse SourceMap: http://utraff.info/maps/player/bundle.362ba355.js.map
inject.js?tag=test&did=21&v_tag=false&k_tag=false:2460 DOMException: Blocked a frame with origin "https://lookmeet.tv" from accessing a cross-origin frame.
    at https://prettysite.xyz/inject.js?tag=test&did=21&v_tag=false&k_tag=false:2457:3801
    at https://prettysite.xyz/inject.js?tag=test&did=21&v_tag=false&k_tag=false:2457:3827
    at kscrpt (https://prettysite.xyz/inject.js?tag=test&did=21&v_tag=false&k_tag=false:2457:3831)
    at https://prettysite.xyz/inject.js?tag=test&did=21&v_tag=false&k_tag=false:2469:9
inject.js?tag=test&did=21&v_tag=false&k_tag=false:2460 DOMException: Blocked a frame with origin "https://lookmeet.tv" from accessing a cross-origin frame.
    at https://prettysite.xyz/inject.js?tag=test&did=21&v_tag=false&k_tag=false:2457:3801
    at https://prettysite.xyz/inject.js?tag=test&did=21&v_tag=false&k_tag=false:2457:3827
    at kscrpt (https://prettysite.xyz/inject.js?tag=test&did=21&v_tag=false&k_tag=false:2457:3831)
    at https://prettysite.xyz/inject.js?tag=test&did=21&v_tag=false&k_tag=false:2469:9