Preupgrade Tool failed with INTERNAL ERROR

(Doc ID 2416532.1)

Last updated on JUNE 30, 2018

Applies to:

Oracle Database - Standard Edition - Version 12.2.0.1 and later
Information in this document applies to any platform.

Symptoms

While upgrading Oracle database from 12.1.0.2.0 to 12.2.0.1.0, preupgrade.jar execution resulted in below error 

These errors messages were detected in : preupgrade_messages.properties

INTERNAL_ERROR=INTERNAL ERROR: An internal preupgrade error occurred that prevents further execution. This is unexpected and usually caused by some sort of internal inconsistency. You may want to contact Oracle Support. The internal error message is:
INVALID_XML=An internal error occurred. The generated XML is unexpectedly invalid.
MESSAGE_NOT_FOUND=An internal error occurred. The preupgrade tool could not find an intended message in preupgrade_messages.properties.

Cause

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