Some erros with discjuggler..

Hi there, i have a problem... i trying to copy some friend's cds.. (all dc backups).. but i can't... i trying to copy with diskjuggler doing image.... but it says "invelid pack size erro"... or it says another erros... I tryed to copy'em cd to cd.. but dpn't work to..i mean...i away copy cds with diskjuggler.. but with some of 'em i get error... please dudes.. help me! Some time i get "Each softwere should i use to copy'em better? Why this errors hapen do me? U have an HP cd-writter 9100 series 8x.. please help!