Child node "2" exited prematurely
<p>I recently retargeted my Windows 8.1 app to Windows 10.  I'm getting this error when building the UI projects, </p>

<pre><code>"MSBUILD : error MSB4166: Child node "2" exited prematurely. Shutting down. Diagnostic information may be found in files in the temporary files directory named MSBuild_*.failure.txt."
</code></pre>

<p>That's not particularly useful, so I went to %temp% looking for said failure log, and it doesn't exist.  Am I looking in the wrong "temp" directory?</p>

<p>What causes this error?  I can build my supporting library project without this error.</p>