Wix Build Error
Not sure about other problems that might cause this but I was unaware that Wix is not installed alongside ms build.
I was trying to build a project that was sat on our build server and ran into this problem.
You need to download and install it from http://wix.sourceforge.net/ first.
Another commonly used package is MSBuild Community tasks which is available from
https://github.com/loresoft/msbuildtasks
The last stable release is downloadable from the bit called nightly builds!
This will give a similar error message.