That screenshot shows me what I need to correct the issue. It also shows me the route that is being taken through the batch file so that I can reproduce and check the fix.
I will upload a fixed beta4 in a few hours time after I have checked the change that needs making.
In the meantime if java is on your search path you can launch using the command
Code:
javaw -cp OpdsOutput-2.4-SNAPSHOT.jar Gui