The web URL is wrong for the testing server. The web URL for the remote server should be your domain name. But if your testing server is not the one hosting the domain you will get an error. The address should be something like http://localhost/pathto/site or http://local_ip_adddress/pathto/site . I don't use XAMPP personally so I cannot tell you which will work. Sometimes those programs by default also use something other than the default web port 80 in which case your address could look like http://localhost:port/pathto/site.
it works perfectly now after entering "localhost/designsquick" as the web URL, thanks!