If you install additional software in build server, or in a target server setup as a release server with build/release agent TFS 2015, you might run into the same issues specified below, which can be solved very easily.
2016-06-28T08:56:24.4848312Z ##[error]The system cannot find the file specified.
2016-06-28T08:56:24.5316991Z The 'sphinx-build' command was not found. Make sure you have Sphinx
2016-06-28T08:56:24.5316991Z installed, then set the SPHINXBUILD environment variable to point
2016-06-28T08:56:24.5316991Z to the full path of the 'sphinx-build' executable. Alternatively you
2016-06-28T08:56:24.5316991Z may add the Sphinx directory to PATH.
2016-06-28T08:56:24.5316991Z If you don't have Sphinx installed, grab it from