ERROR_TOO_MANY_TCBS 0x8007009B

Error code 155 · HRESULT 0x8007009B

WINDOWS

Cannot create another thread.

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_TOO_MANY_TCBS is a Windows error code (system error 155, returned as HRESULT 0x8007009B) reported by Windows. Its official message is: “Cannot create another thread.”

How to fix ERROR_TOO_MANY_TCBS

  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_TOO_MANY_MUXWAITERSERROR_TOO_MANY_SEM_REQUESTSERROR_TOO_MANY_SEMAPHORESERROR_TOO_MANY_MODULESERROR_LABEL_TOO_LONGERROR_SIGNAL_REFUSEDERROR_INVALID_LIST_FORMAT

Source: Microsoft WinError.h

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