When I am opening my admin panel, the pages are not loading properly.please help me to resolve this error as soon as possible
Magento requires a TLD to operate correctly (could also be a Chrome issue, I'm not sure, in Magento 1.x this only happened in Chrome, but not in other browsers).
Try accessing your site on
127.0.0.1 (make sure to reflect this in your config settings as well), or setup a vhost so you can access it like
www.awesome.dev or something.
Also: all the other suggestions like cache clearing and static content deployment might be required (unless you have developer mode enabled).