my website is also not opening instead of it an advertisement is showing. my domain is studywithshadab.com
I moved your question to a new topic. The original topic was about a server not found error, not about advertisements being shown on a domain. Please create a new topic for your question unless you have 100% absolutely sure that you have the exact same issue. In this case, the described symptoms are very different from what was explained in the other topic.
But I don’t see any advertisements on your page, just a blank website.
Your domain is pointing to BigRock nameservers, ns1.epizy.com.namesilo.com and ns2.epizy.com.namesilo.com. Please remove the BigRock nameservers and those ones and change them to ns1.byet.org, ns2.byet.org, ns3.byet.org, ns4.byet.org and ns5.byet.org from BigRock’s NameServers Management Panel for your domain, so the website will work fine.