umm okay den, got any ideas?

Traceback (most recent call last):
  File "gbz80disasm.py", line 902, in <module>
    output = disasm.output_bank_opcodes(start_addr,stop_addr,hard_stop=args.dry_run,parse_data=args.parse_data)[0]
  File "gbz80disasm.py", line 774, in output_bank_opcodes
    opcode_output_str = opcode_str.format(target_label)
ValueError: Unknown format code 'x' for object of type 'str'