There all there.
I logged on to one of the PC's having this problem and also get the same error.
It writes the initial XML file to the temp folder. But if you select a stylesheet that writes an html page, the page that is written (InRoadsReport.htm) is bare bones - title only.
If you select a report that writes a TXT file, there is a zero byte InRoadsReport.txt file.
On my PC that it works, when switching from TXT to HTML output, the InRoadsReport.<ext> file that is no longer needed is removed. On the PC that does not work, the InRoadsReport.<ext> file remains.