Here are some simple tips you can try to solve this problem from your end.
Make sure that the URL typed/clicked correctly. This includes spelling of the URL, correct slashes, file extension of the page and so forth.
If you are able to visit the page from another device, such as your phone, clearing the cache and cookies will usually solve the problem. If you dont know how to clear browser cache then click here
If above steps wont solve the problem then go ahead and send a message to support@mirasee.com with the URL you are trying to access and let them know of the 404 error.