What does Windows error code 133 (ERROR_IS_JOIN_TARGET) mean? Status / error code: Category: Constant name: Source: Operating System: Description: A JOIN or SUBST command cannot be used for a drive that contains previously joined drives. Could be also: ConstantTypeOS EISCONNerrnoSolaris EOWNERDEADerrnoWindows SETUP_FAILUREBugCheck CodeWindows Looking for a different code? Search another status or error code.