Second nibble is not a digit. Error at offset 0

[glangho]

Hello,

I have a Z/OS rdw file with some fixed length sections and some variable sections. I've created all the necessary classes from the copybook successfully, but when I try to read the mainframe file from my desktop it seems to fail immediately. Is there something special I need to do to handle rdw format? This is all that I have in my main method:

        File input = new File("C:/temp/CLSMULTI.bin");
        byte[] hostData = IOUtils.toByteArray(new FileReader(input));
        Cob2RecordConverter converter = new Cob2RecordConverter();
        FromHostResult<Record> result = converter.convert(hostData);

which results in:

Exception in thread "main" com.legstar.base.visitor.FromCobolException: Second nibble is not a digit. Error at offset 0 : [0x0B100000F3<-F0F6F6F6D4F2F0F1F8F0F6F2F1F2F0F0]. COBOL variable path: RECORD/CLS-KEY/CLS-SOC-NUM. COBOL type: CobolZonedDecimalType

This is literally the first field in the copybook:
000100 01 RECORD. 00010000
001700 05 CLS-KEY. 00170000
001900 10 CLS-SOC-NUM PIC 9(5). 00190000

thanks