Opening App Engine Studio throws an error "We encountered an error while fetching templates"Issue Opening App Engine Studio throws an error "We encountered an error while fetching templates"Refer the screenshot below. CauseIn the "sys_app_template" table, there are two 'Classic UI' records where as one among them is missing a flow.In the instance there is a "sys_app_template_definition" table existing but this table was never shipped so it is not required.ResolutionTo resolve the issue, you need to: Delete the duplicate Classic UI record in "sys_app_template" table that does not have a flow associated with it.Drop the table "sys_app_template_definition" from the instance.On the Sub Prod, apply cache and reload the page. Related LinksPlease review these related Known Errors: App Engine Studio templates fail loading with message "We encountered an error while fetching templates" (ih-hr-uxf-components plugin negatively interacts w/ AES)Creating app templates fails with error "We encountered an error while fetching templates"