error in CesiumLanguageConverter

I am trying to use the CesiumLanguageConverter but I am getting an error. I was able to build it sucessufluy using Visual Studio 2012 but when I run it in the command line I keep getting the and "invalid URI" error.
Anyone have any tips on how to get past this? I would appreciate it.
Thank you.

Can you copy/paste the stack trace for the invalid URI error you’re getting? Are you running the converter with a file path to a file on your computer? I don’t think it handles HTTP URLs on the command line.