---
title: "Failed to call MS XML parser Class not registered"
slug: "failed-to-call-ms-xml-parser-class-not-registered"
updated: 2024-04-02T13:45:24Z
published: 2024-04-02T13:45:24Z
canonical: "kb.pharos.com/failed-to-call-ms-xml-parser-class-not-registered"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://kb.pharos.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Failed to call MS XML parser Class not registered

I receive the following error message from the Popup Client interface:

"Failed to call MS XML parser Class not registered"

---

Install Microsoft Core XML Services (MSXML) 6.0, available at:

[http://www.microsoft.com/downloads/details.aspx?familyid=993c0bcf-3bcf-4009-be21-27e85e1857b1&displaylang=en](http://www.microsoft.com/downloads/details.aspx?familyid=993c0bcf-3bcf-4009-be21-27e85e1857b1&displaylang=en)

## Related

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- [Blueprint Server Configuration tool fails the Blueprint tracker test with error message "utf/html was returned and utf/xml was expected".](/blueprint-server-configuration-tool-fails-the-blueprint-tracker-test-with-error-message-utfhtml-was-returned-and-utfxml-was-expected.md)