What does Windows error code 150 (ERROR_SYSTEM_TRACE) mean? Status / error code: Category: Constant name: Source: Operating System: Description: System trace information was not specified in your CONFIG.SYS file, or tracing is disallowed. Could be also: ConstantTypeOS EINPROGRESSerrnoSolaris INVALID_WORK_QUEUE_ITEMBugCheck CodeWindows Looking for a different code? Search another status or error code.