autoupgrade crashes with error: UpgradeConfigDBValidator.findDBVersion
i have a oracle 12 CDB-PDB database.
most recent installed patches are the JULY 2020 critical patch updates for database and JVM
i downloaded the most recent version of autoupgrade.jar
when i run autograde.jar it crashes with this message in autoupgrade_err.log:
2020-07-23 10:08:57.830 ERROR It was not possible to determine the version value of database csgwst from the returned value select version_full from sys.v$instance - UpgradeConfigDBValidator.findDBVersion
the column version_full is introduced in oracle 18 and is not available in oracle 12.
does anyone have a clue how to resolve this?