New Post: VS 2012, StyleCop 4.7.44

I'm getting the following error:
[msbuild] E:\hudson\buildIncludes\msbuild\StyleCop.msbuild(18,5): error : Failed to add file: E:\hudson\jobs\LindbergCorp.Website\workspace\trunk\LindbergCorp\Default.aspx.cs

The msbuild task at line 18 is as follows:

<MSBuild.ExtensionPack.CodeQuality.StyleCop
      TaskAction="Scan"
      ShowOutput="true"
      ForceFullAnalysis="true"
      CacheResults="false"
      LogFile="$(ResultsDir)\StyleCopLog.txt"
      SettingsFile="E:\Program Files\StyleCop 4.7\Settings.StyleCop"
      SourceFiles="@(StyleCopFiles)"
    >
      <Output TaskParameter="Succeeded" PropertyName="AllPassed"/>
      <Output TaskParameter="ViolationCount" PropertyName="Violations"/>
      <Output TaskParameter="FailedFiles" ItemName="Failures"/>
    </MSBuild.ExtensionPack.CodeQuality.StyleCop>

I have verified that the path to the file is correct.
I have uninstalled and reinstalled both stylecop and the latest version of MsBuild extension pack.

Any assistance would be greatly appreciated.
Thanks -- Dan'l