Sitefinity ASP.NET CMS - Content Management System

public class AlightenContactConfiguration : ConfigurationSection
{

 [ConfigurationProperty("serverAddress", IsRequired = true, IsKey = true)]
 public string ServerAddress {
  get { return (string)this("serverAddress"); }
  set { this("serverAddress") = value; }
 }

 [ConfigurationProperty("serverPort", IsRequired = true, IsKey = true)]
 public string ServerPort {
  get { return (string)this("serverPort"); }
  set { this("serverPort") = value; }
 }

 [ConfigurationProperty("serverSpecifyPort", IsRequired = true, IsKey = true)]
 public string ServerSpecifyPort {
  get { return (string)this("serverSpecifyPort"); }
  set { this("serverSpecifyPort") = value; }
 }

 [ConfigurationProperty("serverAuthenticate", IsRequired = true, IsKey = true)]
 public string ServerAuthenticate {
  get { return (string)this("serverAuthenticate"); }
  set { this("serverAuthenticate") = value; }
 }

 [ConfigurationProperty("clientTemplate", IsRequired = true)]
 public string ClientTemplate {
  get { return (string)this("clientTemplate"); }
  set { this("clientTemplate") = value; }
 }

 [ConfigurationProperty("employeeTemplate", IsRequired = true)]
 public string EmployeeTemplate {
  get { return (string)this("employeeTemplate"); }
  set { this("employeeTemplate") = value; }
 }

 [ConfigurationProperty("baseURL", IsRequired = true)]
 public string BaseURL {
  get { return (string)this("baseURL"); }
  set { this("baseURL") = value; }
 }

 [ConfigurationProperty("from", IsRequired = true)]
 public string From {
  get { return (string)this("from"); }
  set { this("from") = value; }
 }

 [ConfigurationProperty("username", IsRequired = true)]
 public string Username {
  get { return (string)this("username"); }
  set { this("username") = value; }
 }

 [ConfigurationProperty("password", IsRequired = true)]
 public string Password {
  get { return (string)this("password"); }
  set { this("password") = value; }
 }

 [ConfigurationProperty("employeeRecipients", IsRequired = true)]
 public string EmployeeRecipients {
  get { return (string)this("employeeRecipients"); }
  set { this("employeeRecipients") = value; }
 }

 [ConfigurationProperty("clientSubject", IsRequired = true)]
 public string ClientSubject {
  get { return (string)this("clientSubject"); }
  set { this("clientSubject") = value; }
 }

 [ConfigurationProperty("employeeSubject", IsRequired = true)]
 public string EmployeeSubject {
  get { return (string)this("employeeSubject"); }
  set { this("employeeSubject") = value; }
 }
}

//=======================================================
//Service provided by Telerik (www.telerik.com)
//Conversion powered by NRefactory.
//Built and maintained by Todd Anglin and Telerik
//=======================================================

However, I suspect that there is something missing from the web.config. In the config sections you should have

And then in the Alighten section: