dotCover Command Line Execution using ReSharper

Hi Guys

I'm evaluting dotCover to replace TFS code coergage. I'm using about to start getting it to run against our CI and fallen at the first hurdle. I've set up the coverage.xml but when I run it I get a unhandled exception of "[JetBrains dotCover] Unhandled exception: Base directory is not specified". Can't find any help on this anywhere. Anyone got any ideas?

Here's my config file.

<?xml version="1.0" encoding="utf-8"?>
<AnalyseParams>
  <TargetExecutable>C:\Program Files (x86)\JetBrains\ReSharper\v8.2\Bin\JetBrains.ReSharper.TaskRunner.CLR4.exe</TargetExecutable>
  <TargetArguments>C:\Projects\Sources\Engine\Tests\bin\Debug\Tests.dll</TargetArguments>
  <TargetWorkingDir>C:\Projects\Sources\Engine\Tests\bin\Debug</TargetWorkingDir>
  <Output>C:\Projects\dotCover\output.xml</Output>
</AnalyseParams>

ReSharper version 8.2.
dotCover version 2.7

Thanks for your help.

Chris