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Getting "FATAL ERROR OOX2019: Office 16 is currently not supported"


Question / Problem: 

Specific Master Templates, rich text blocks or inserted documents using post-includes result in one of the following errors:

REP0617: Parsing <<document>> for includes failed or 

REP0853: Conversion to idoc format failed.

The error on Core is OOX2019: Office 16 is currently not supported.

Answer / Solution: 

This is caused by a reference to a specific (unused) namespace in the document in question. A safety check implemented in KCM prevents this document from being converted, resulting in above error. 

This was classified as a defect and was resolved in KCM versions 5.3.1 and above. You need to update to KCM 5.3 and install service pack 1, or update to a newer KCM version altogether.

As an alternative to upgrading KCM to 5.3.1, you can also downgrade Office back to a version that does not exhibit this issue. The last version that does not produce this error is the version from 2019 August 13, Version 1907 (Build 11901.20218). To downgrade office, please see this Microsoft article:

Applies to:  

Product Version
KCM 5.3 and earlier