What does Windows error code 151 (ERROR_INVALID_EVENT_COUNT) mean? Status / error code: Category: Constant name: Source: Operating System: Description: The number of specified semaphore events for DosMuxSemWait is not correct. Could be also: ConstantTypeOS ESTALEerrnoSolaris BOUND_IMAGE_UNSUPPORTEDBugCheck CodeWindows Looking for a different code? Search another status or error code.