Custom Configuration Issue .NET 4.0

Question

I have read a good 15+ articles and tutorials on creating custom configuration sections, and I can't seem to 'get' the custom configuration. ANY help would be appreciated, since I am clearly missing something. It is a simple program to schedule backups and specify a list of source/destination directories.

I am receiving the error: Unrecognized element 'add'. (BattistoneBackup.exe.Config line 8)

My App.config file looks like this:

 <?xml version="1.0"?>
<configuration>
  <configSections>
    <section name="backupDirectories" 
type="Battistone.WindowsService.BattistoneBackup.BackupDirectorySection,
 BattistoneBackup, Version=1.0.0.0, Culture=neutral, 
PublicKeyToken=null"/>
    <section name="backupSchedule" 
type="Battistone.WindowsService.BattistoneBackup.BackupScheduleSection, 
BattistoneBackup, Version=1.0.0.0, Culture=neutral, 
PublicKeyToken=null"/>
  </configSections>
  <backupDirectories>
    <add Name="DEV_Sports_Source" 
SourceDirectory="C:\Dustin\Development\Visual 
Studio\Projects\Battistone\Sports\" 
DestinationDirectory="C:\Dustin\BACKUPTEST\Development\Visual 
Studio\Projects\Battistone\Sports\"/>
    <add Name="DEV_Builds" 
SourceDirectory="C:\Dustin\Development\Visual 
Studio\Projects\Battistone\Builds\" 
DestinationDirectory="C:\Dustin\BACKUPTEST\Development\Visual 
Studio\Projects\Battistone\Builds\"/>
  </backupDirectories>
  <BackupSchedule>
    <add BackupFrequency="Daily" BackupDays="Mon" BackupTime="23:00:00" />
  </BackupSchedule>
  <startup>
    <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.0,Profile=Client"/>
  </startup>
</configuration>

I am using the following line of code to retrieve the configuration:

 BackupDirectorySection oBackupDirectoriesConfigurationSection = BackupDirectorySection.GetConfig();

Here are the classes to wrap the configuration above (all inside the "Battistone.WindowsService.BattistoneBackup" namespace):

public class BackupDirectorySection : ConfigurationSection
{
    public static BackupDirectorySection GetConfig()
    {
        return ConfigurationManager.GetSection("backupDirectories") as BackupDirectorySection;
    }

    [ConfigurationProperty("backupDirectories")]
    public BackupDirectoryConfigurationCollection BackupDirectories
    {
        get
        {
            return this["backupDirectories"] as BackupDirectoryConfigurationCollection;
        }
    }
}


public class BackupDirectoryConfigurationCollection : ConfigurationElementCollection
{
    public BackupDirectoryConfiguration this[int index]
    {
        get
        {
            return base.BaseGet(index) as BackupDirectoryConfiguration;
        }
        set
        {
            if (base.BaseGet(index) != null)
            {
                base.BaseRemoveAt(index);
            }
            this.BaseAdd(index, value);
        }
    }

    protected override ConfigurationElement CreateNewElement()
    {
        return new BackupDirectoryConfiguration();
    }

    protected override object GetElementKey(ConfigurationElement element)
    {
        return ((BackupDirectoryConfiguration)element).Name;
    }
}


public class BackupDirectoryConfiguration : ConfigurationElement
{
    [ConfigurationProperty("Name")]
    public string Name
    {
        get
        {
            return (string)this["Name"];
        }
        set
        { this["Name"] = value; }
    }

    [ConfigurationProperty("SourceDirectory")]
    public string SourceDirectory
    {
        get
        {
           return (string)this["SourceDirectory"];
        }
        set
        { this["SourceDirectory"] = value; }
    }

    [ConfigurationProperty("DestinationDirectory")]
    public string DestinationDirectory
    {
        get
        {
            return (string)this["DestinationDirectory"];
        }
        set
        { this["DestinationDirectory"] = value; }
    }
}