ZSDK_DemosAndroid Program: ZebraPrinterLanguageUnknownException

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Hello. I'm testing the connection to a ZTC ZT230-203dpi ZPL printer. I tried using the demo program ZSDK_DemosAndroid provided in the link-os sdk package. However, a ZebraPrinterLanguageUnknownException is thrown when this line of code is being run:
printer = ZebraPrinterFactory.getInstance(printerConnection);

Here's the URL of the printer:
http://phub4.dyndns-ip.com:59901/

Any ideas? Thanks in advance!