If you Google Oxc19a0024 it leads to many results, most of which refer to an ink system failure. When I Goolged your entire subject line (HP C6300 Oxc19a0024) I located a possible solution which may help you:
HP Photosmart C6180 Ink System Failure from fixyourownprinter.com http://www.fixyourownprinter.com/forums/printer/50063
Hope this helps you out.