How to solve Error SPSite - The Web application at address could not be found

Question

Hello,
I am trying to find out the internal name of a custom SharePoint list columns, for this I have used following code snippet in my
console application but getting below error. The site I am accessing is a public SharePoint web site. This code is working
well with my local host site and i am able to get the internal names of any list columns but don't understand why this is failing with
public SharePoint site
For avoiding this issue I have done following steps:
1.Rebuild the application
2.changed the  platform target as "Any CPU"
3.Visual studio and this public site is working in my admin account, but still I am getting the error!
I use visual studio 2010 and SharePoint 2010
please note the error I am getting
Error : The Web application at https://public.sp.a5-group.com/ could not be found. Verify that you have typed the URL correctly.
If the URL should be serving existing content, the system administrator may need to add a new request URL mapping to the intended application
Code Snippet
static void Main(string[] args)
using (SPSite Site = new SPSite("https://public.sp.a5-group.com/"))
using (SPWeb web = Site.RootWeb)
SPList splst = web.Lists["ListCard"];
foreach (var field in splst.Fields)
bool isHidden = splst.Fields[field.ToString()].Hidden;
if (!isHidden)
string internalName = splst.Fields[field.ToString()].InternalName; //This will give you the internal column name.
Console.WriteLine(internalName);
Console.ReadLine();

Answer 1

I thin you need to have sharepoint installed on same computer and URL should be working on this computer.
If this URL WEB APP is in your IISsite try to create disableloopbackcheck registry which should be help
When you use the fully qualified domain name (FQDN) or a custom host header to browse a local Web site that is hosted on a computer that is running Microsoft Internet Information Services (IIS) 5.1 or a later version, you may receive an error
message 
http://support.microsoft.com/kb/896861