TFS 2017 MSBuild 15 task Error:MSB4184 - Illegal characters in path

Question

I'm converting a TFS 2013 XAML build to TFS 2017 task build. I get this error when building a project file:

2019-06-20T17:23:37.0504912Z ##[debug]Processed: ##vso[task.logissue type=Error;sourcepath=C:\Program Files (x86)\Microsoft Visual Studio\2017\Enterprise\MSBuild\Microsoft\VisualStudio\v15.0\Fakes\Microsoft.QualityTools.Testing.Fakes.targets;linenumber=13;columnnumber=5;code=MSB4184;]The expression "[System.IO.Path]::Combine(C:\Agent_work\1\s\Code\DatabaseProjects\Audit\, obj\Auto\Any CPU|Default\Fakes)" cannot be evaluated. Illegal characters in path.

I've looked everywhere for what's happening and nothing is jumping out at me.

Answer 1

My initial problem was focusing on the comma in the IO.Path.Combine rather than the pipe char later on. Once I realized it was the dang pipe I figured it out ASAP.

In TFS 2013 XAML builds the Configurations line has the platform and configuration separated by the pipe char. However in TFS 2017 task builds there are two lines. One for Platform and another for Configuration. Once I put Any CPU as the platform and Default as the Configuration things started working much better.