SQLDependency Error Unhandled Exception

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C#

SQL

server

I am getting the following error when I try to run a basic data watching program.

Unhandled Exception: System.ArgumentNullException: Value cannot be null.
Parameter name: connectionString
at System.Data.SqlClient.SqlDependency.Start(String connectionString, String queue, Boolean useDefaults)
at SqlDependencyTest.Program.Main(String[] args)

Main code

static void Main()
{
Console.WriteLine("Starting Software");//For debug only
SqlDependency.Start(GlobalVars.RS2Events);
Console.WriteLine("Depend Started";);//for debug only

// Registering for changes...
ConnectForChanges();
Console.WriteLine("Registered");//Delete in end
// Only for testing
Console.WriteLine("Make some changes to the Events table.");
Console.WriteLine("Every time a change happens in this ");
Console.WriteLine("program should be notified.\n");
Console.WriteLine("Hit enter to quit this program.");
Console.ReadLine();
// Quitting...
SqlDependency.Stop(GlobalVars.RS2Events);
}

The key in the app.config file

<add key="RS2EDB" value="Data Source=FMVIDSRV1\AIUNIVERSAL;database=AIUEvents_20100318092430;User ID=SCIWatcher;Password=SC1Access;">

The variable in GlobalVars
public static string RS2Events = ConfigurationManager.AppSettings.Get("RS2EDB");


NEED HELP PLEASE