I’m able to trigger similar error message if changing the default database storage engine. @lcmartinezru or @Ahm_Zahirul_Alam, can you make another test upgrade attempt after adding in PKPApplication class after this line: pkp-lib/PKPApplication.inc.php at 88c9965b2f601b79e034ceaff59d8a809b72943d · pkp/pkp-lib · GitHub
Additional line with the content:
'engine' => 'InnoDB',
and see if that makes any difference. This will ensure that only the engine that supports foreign key constraints is used.