Less Common ID Codes For the remaining error messages numbered 15 or higher, a corrupted System file is a ... Since you cana#39;t always expect to get clear instructions by decoding them, you may want to repair your Mac by trying the solutions we describe. ... error typically occurs when a programmer forgets to remove code used during the testing of an application. ... (I would recommend a sp it book by a specific author, but then, that might be construed as blatant self- promotion.)anbsp;...