ERROR_NOT_CHILD_WINDOW 0x800705A2

Error code 1442 · HRESULT 0x800705A2

WINDOWS

The window is not a child window.

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_NOT_CHILD_WINDOW is a Windows error code (system error 1442, returned as HRESULT 0x800705A2) reported by Windows. Its official message is: “The window is not a child window.”

How to fix ERROR_NOT_CHILD_WINDOW

  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_HWNDS_HAVE_DIFF_PARENTERROR_INVALID_GW_COMMANDERROR_SCREEN_ALREADY_LOCKED0xC19001010xC19002080xC19002000xC1900223STATUS_ACCESS_VIOLATION

Source: Microsoft WinError.h

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