Add Subsonic 3.0.0.4 in Visual Studio 2010

I've created a console application focused on C#3.5 and added a reference to System.Web, System.Configuration and Subsonic.Core. Also have in config file

    <?xml version="1.0"?>
<configuration>
    <configSections>
    </configSections>
    <connectionStrings>
        <add name="UpdateCotswolds.Properties.Settings.Live_IntegraConnectionString" connectionString="Data Source=POSERVER;Initial Catalog=Live_Integra;Integrated Security=True" providerName="System.Data.SqlClient"/>
    </connectionStrings>
<startup><supportedRuntime version="v2.0.50727"/></startup></configuration>

I've then edited Settings.ttinclude

const string Namespace = "Integra.Data";
    const string ConnectionStringName = "UpdateCotswolds.Properties.Settings.Live_IntegraConnectionString";

    //This is the name of your database and is used in naming
    //the repository. By default we set it to the connection string name
    const string DatabaseName = "Live_Integra";

And dragged in the tt files.

When they run I'm getting the error...

Error   2   Running transformation: System.InvalidOperationException: Sequence contains more than one matching element
   at System.Linq.Enumerable.SingleOrDefault[TSource](IEnumerable`1 source, Func`2 predicate)
   at Microsoft.VisualStudio.TextTemplating47D0892A160210D689C6B90986A9AE0D.GeneratedTextTransformation.LoadTables() in c:\Programming\UpdateCotswolds\UpdateCotswolds\SQLServer.ttinclude:line 134
   at Microsoft.VisualStudio.TextTemplating47D0892A160210D689C6B90986A9AE0D.GeneratedTextTransformation.TransformText() in c:\Programming\UpdateCotswolds\UpdateCotswolds\ActiveRecord.tt:line 23
   at Microsoft.VisualStudio.TextTemplating.TransformationRunner.RunTransformation(TemplateProcessingSession session, String source, ITextTemplatingEngineHost host, String& result)

This is the line in question...

var pkColumn=tbl.Columns.SingleOrDefault(x=>x.Name.ToLower().Trim()==tbl.PrimaryKey.ToLower().Trim());

I'm guessing I'm making a silly mistake and hopefully someone can set me straight...

Thanks in advance...