ERROR_SXS_XML_E_RESERVEDNAMESPACE 0x800736F2

Error code 14066 · HRESULT 0x800736F2

WINDOWS

Manifest Parse Error : The namespace prefix is not allowed to start with the reserved string "xml".

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_SXS_XML_E_RESERVEDNAMESPACE is a Windows error code (system error 14066, returned as HRESULT 0x800736F2) reported by Windows. Its official message is: “Manifest Parse Error : The namespace prefix is not allowed to start with the reserved string "xml".”

How to fix ERROR_SXS_XML_E_RESERVEDNAMESPACE

  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_SXS_XML_E_INVALIDENCODINGERROR_SXS_XML_E_UNCLOSEDCDATAERROR_SXS_XML_E_INVALIDSWITCHERROR_SXS_XML_E_UNCLOSEDDECLERROR_SXS_XML_E_UNCLOSEDCOMMENTERROR_SXS_XML_E_BADXMLCASEERROR_SXS_XML_E_UNCLOSEDSTRING

Source: Microsoft WinError.h

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