ERROR_SUBST_TO_SUBST 0x8007008B

Error code 139 · HRESULT 0x8007008B

WINDOWS

The system tried to substitute a drive to a directory on a substituted drive.

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_SUBST_TO_SUBST is a Windows error code (system error 139, returned as HRESULT 0x8007008B) reported by Windows. Its official message is: “The system tried to substitute a drive to a directory on a substituted drive.”

How to fix ERROR_SUBST_TO_SUBST

  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_SUBST_TO_JOINERROR_DIR_NOT_EMPTYERROR_JOIN_TO_JOINERROR_JOIN_TO_SUBSTWSAHOST_NOT_FOUNDERROR_SXS_CANT_GEN_ACTCTXERROR_SXS_COMPONENT_STORE_CORRUPTERROR_INSTALL_OPEN_PACKAGE_FAILED

Source: Microsoft WinError.h

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