Java Sample- Failed to open printer ZDesigner GX420d

As the title says. Attempting to print a config page from my ZP505 using the command line command:

    java -jar "ZSDK_API.jar" config "ZDesigner GX420d" --driver --config

from the correct directory results in the error "Failed to open printer ZDesigner GX420d". I've tried the solution in this thread.

Although I get a result back from direct communication and can print test pages from Zebra Setup Utilities, using the SDK via command line still does not work.