Software⏱️ 1 min read📅 2026-05-31

How to Fix: Error: The processing instruction target matching "[xX][mM][lL]" is not allowed

Invalid XSLT syntax: Processing instruction target mismatch

Quick Answer: Ensure that the XML declaration and namespace prefix match exactly, without any case variations (e.g., "[xX][mM][lL]" should be [~xX\mm\LL]).

📋 Table of Contents

  1. 💡 Why You Are Getting This Error
  2. 🚀 How to Resolve This Issue

Error: The processing instruction target matching "[xX][mM][lL]" is not allowed

💡 Why You Are Getting This Error

  • [Cause]

🚀 How to Resolve This Issue

Method 1: Fixing the XML Version

  1. Step 1: Change the XML version to 1.0 or 1.1 (e.g., <?xml version=

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