I have installed AMITY in my PC for configuration of DICS6200. There is an error message pop up while open the AMITY application, "Could not start network listener". For your information, the Firewall is off and there is no already running AMITY.
I've installed the application from the official website and it works normally. I didn't encounter any error like the one you've posted above. After installation, it's recommended to run the product as Administrator. This gives exclusive access to the system resources for the app to run properly.
Here is the official website with the downloads. Download the latest version and install it and use the user guide as well.
Downloads page: http://www.jotron.com/Kategori/ICS-6200-Communication-Systems/1356.php#downloads