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Note the filename (%1) and line number (%2) displayed in the alarm message. Access the file via HMI file manager or service mode (Startup > Commissioning > System Data).

Open the indicated XML file with a text editor (use HMI text editor or transfer file to service laptop). Navigate to the specified line number and examine the XML structure.

Create a backup copy of the XML file before making any modifications.

Check for common XML errors: missing closing tags (</tag>), unclosed angle brackets, unescaped special characters (&, <, >, ', "), missing quotation marks around attributes, or incorrect nesting of elements.

Correct the identified syntax error, save the file, and perform a control restart (NCK and HMI) to reload the corrected XML structure. Verify alarm clears and functionality is restored.

Identify the affected file from alarm text. Check if recent file transfers, updates, or archive restore operations were performed on this file.

Compare file size and timestamp with a known good backup or template file. Use CF card or network backup to verify file integrity.

If corruption is suspected, restore the XML file from a verified backup archive. Ensure proper shutdown procedures before file replacement.

Always use NCK-safe file transfer methods and avoid interrupting data operations to prevent corruption.

If no backup exists, recreate the file from system defaults or manufacturer-supplied templates. Perform control restart and verify system functionality.

Review recent manual changes to XML configuration files. Access alarm archive to determine when alarm first occurred and correlate with modification history.

Open the problematic XML file and use an XML validator tool (external software or online validator) to identify all structural errors, not just the first one detected.

Either revert to the previous working version from backup, or systematically correct all XML syntax errors identified by the validator. Pay attention to proper encoding declarations and namespace definitions.

Ensure you understand the functional impact of XML parameters before modification. Incorrect values can cause machine behavior changes even with valid syntax.

After correction, validate the XML structure is complete and properly formed. Restart the control system and test the affected functionality (HMI display, user cycles, tool management, etc.).