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Hi,
Likely a plugin or a blueprint didn't manage to update to 5.2 correctly. If you have a plugin that is used by every project with this error, then I suggest disabling the plugin.
People had similar problems here: https://forums.unrealengine.com/t/converted-ue4-project-to-ue5-having-trouble-packaging-a-build-resolved/517213
Warmest regards,