I know this is an old thread but for anyone that is having the same problem, this might help. I had the same problem after upgrading to v8.2.x but after some tests I found the cause. Splunk Enterprise 8.2.x has some new integrated apps which are not part of the version I was upgrading from (7.2.x). In particular "Python Upgrade Readiness App" which comes in the version 1.0.0 but has the option to Update to a newer available version. This is what I found out: - If I do not update the "Python Upgrade Readiness" from version 1.0.0, I do not get any error message. I can also safely disabled the app and no error message appears after. - If I update "Python Upgrade Readiness" to the latest version (when this is written, latest version is 3.10), I get this error and even though I disable the App after upgrade. The error message still remains. The only way I found to get rid of the error message after updating the App was to downgrade back to version 1.0.0. To downgrade, simply replace the app folder "$SPLUNK_HOME/etc/apps/python_upgrade_readiness_app" with the 1.0.0 version (I got the old version from a fresh installed Splunk) and then restart Splunk. Voila, all errors gone! This was my solution, it does not have to be the same for others but hopefully helps some.
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