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ErrorLib — Industrial Fault Code Library

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XML_INVTAG

Invalid character in tag

Fanuc · R-30iA R-30iB Controller

What does XML_INVTAG mean?

This error indicates that an XML tag contains characters that are not allowed by XML naming conventions. XML tags must adhere to a strict set of character rules to be considered valid and parsable.

Common Causes

  • An XML tag contains characters not permitted by XML naming rules (e.g., spaces, special symbols other than hyphen or underscore).
  • The tag name includes characters that conflict with reserved XML syntax.
  • Data corruption in the configuration file creating invalid tag names.
  • The parser has strict validation for XML tag identifiers.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Remove invalid characters from the XML tag name in the configuration file.

  2. 2

    Replace invalid characters with permitted ones (e.g., underscore for space).

  3. 3

    Ensure XML tag names start with a letter or underscore and contain only letters, digits, hyphens, underscores, and periods.

  4. 4

    Review the specific XML element definition causing the error.

  5. 5

    Validate the XML file against a formal XML schema if one is provided.

Browse all codes in this manual (31)
Verified technical data. Last updated: April 2026

Related Faults

12328File is not opened12329Cannot write the variable12330Write file failed
Source: Fanuc R-30iA R-30iB Controller
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