ERROR_INVALID_EVENT_COUNT 0x80070097

Error code 151 · HRESULT 0x80070097

WINDOWS

The number of specified semaphore events for DosMuxSemWait is not correct.

Windows troubleshooting diagram: Device Manager warning and a system file scan
Windows errors: check drivers, system files and Event Viewer, in that order.

What it means

ERROR_INVALID_EVENT_COUNT is a Windows error code (system error 151, returned as HRESULT 0x80070097) reported by Windows. Its official message is: “The number of specified semaphore events for DosMuxSemWait is not correct.”

How to fix ERROR_INVALID_EVENT_COUNT

  1. Reboot once — many one-off system codes disappear with a clean restart
  2. Repair system files: 'sfc /scannow' then 'DISM /Online /Cleanup-Image /RestoreHealth'
  3. Find the source in Event Viewer → System: filter for this exact code and open its provider link

Related errors

ERROR_DIR_NOT_EMPTYERROR_SYSTEM_TRACEERROR_TOO_MANY_MUXWAITERSERROR_INSTALL_ALREADY_RUNNINGRPC_S_SERVER_UNAVAILABLEWSAEACCESWSAEADDRINUSEWSAECONNABORTED

Source: Microsoft WinError.h

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