No data in Coverage.XML

I am running NCover with the following settings file xml:

<?xml version="1.0" encoding="utf-8"?>
<ProfilerSettings xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<CommandLineExe>"C:\Program Files\NUnit-Net-2.0 2.2.8\bin\nunit-console" "C:\MyCompany.Common.Utilities\MyCompany.Common.Utilities.NUnit\bin\Debug\MyCompany.Common.Utilities.NUnit.dll"</CommandLineExe>
<Assemblies>MyCompany.Common.Utilities.dll</Assemblies>
<LogFile>c:\BuildTools\CoverageReports\Coverage.Log</LogFile>
<CoverageXml>c:\BuildTools\CoverageReports\Coverage.Xml</CoverageXml>
<WorkingDirectory>C:\MyCompany.Common.Utilities\MyCompany.Common.Utilities.NUnit\bin\Debug</WorkingDirectory>
<VerboseLog>false</VerboseLog>
<ProfileIIS>false</ProfileIIS>
<DumpOnErrorNormal>false</DumpOnErrorNormal>
<DumpOnErrorFull>false</DumpOnErrorFull>
<NoLog>false</NoLog>
</ProfilerSettings>

The on screen console 'report' gives no errors and shows that NUnit test have run successfully.

However when I open the Coverage.XML file there is nothing there. The Coverage.Log file does get populated.

I am running on Microsoft Windows NT 5.1.2600 Service Pack 2 with .NET Version 2.0.50727.42.

Can anyone offer any advice on this please?

Thanks

James