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DRAFT KB-XXXX Engines fail to boot up with " file not found" error


After attempting to start the engines via the start-suite script, the checkengine script displays an error like this:

On examining the db_**.log for the relevant engine, the following error is seen:

2016-10-24 21:05:48 [PO1] {ap39.kdb ,6713} () FATAL .a.db " file not found"

Only if you observe the above two symptoms, proceed to the following section to understand the "Cause" and the "Action".


The migration directory present in <APPIAN_HOME>/server/*engine* directory is missing due to accidentally deleting or moving it to a different location.


Re-install Appian and test the install/upgrade again.

Affected Versions

This article applies to Appian 17.2 and earlier