MSBuild error when using Octopack true

A NuSpec file named ‘ISB.nuspec’ was not found in the project root, so the file will be generated automatically. However, you should consider creating your own NuSpec file so that you can customize the description properly.
10/3/2017 4:50:02 AM : 534> : MSBUILD-VS2013 : OctoPack: Packaging an ASP.NET web application (Web.config detected)
10/3/2017 4:50:02 AM : 534> : MSBUILD-VS2013 : OctoPack: NuGet Version: 3.5.0.38733 (Custom build for OctoPack. See http://g.octopushq.com/VersioningInOctopusDeploy)
10/3/2017 4:50:02 AM : 534> : MSBUILD-VS2013 : OctoPack: Attempting to build package from ‘ISB.nuspec’.
10/3/2017 4:50:02 AM : 534> : MSBUILD-VS2013 : MSBUILD : OctoPack error OCTONUGET: Target path ‘C:\Program Files (x86)\Microsoft ASP.NET\ASP.NET MVC 4\Assemblies\System.Net.Http.Formatting.xml’ contains invalid characters. [E:\B\f0c43958-5a19-4307-bb25-dca149b3e5b3\MMS\v2\NextQA\ISB\ISB\ISB.csproj]
10/3/2017 4:50:02 AM : 534> : MSBUILD-VS2013 : MSBUILD : OctoPack error OCTONUGET: Target path ‘C:\Program Files (x86)\Microsoft ASP.NET\ASP.NET MVC 4\Assemblies\System.Web.Http.xml’ contains invalid characters. [E:\B\f0c43958-5a19-4307-bb25-dca149b3e5b3\MMS\v2\NextQA\ISB\ISB\ISB.csproj]
10/3/2017 4:50:02 AM : 534> : MSBUILD-VS2013 : MSBUILD : OctoPack error OCTONUGET: Target path ‘C:\Program Files (x86)\Microsoft ASP.NET\ASP.NET MVC 4\Assemblies\System.Web.Http.WebHost.xml’ contains invalid characters. [E:\B\f0c43958-5a19-4307-bb25-dca149b3e5b3\MMS\v2\NextQA\ISB\ISB\ISB.csproj]

Hi,

Thanks for getting in touch and sorry to hear you’re having trouble with OctoPack. Could I get you to check your project references that refer to assemblies in the GAC? I believe this error can occur if you have Copy local set to true on these assemblies.

Look forward to hearing back and if I can assist further please let me know.

Regards
Shannon