Approval App Template outdated

Hello,   I started working on an app and chose the Appoval App template. I created the forms and built in some logic in Mendix Studio. When I want to work in Mendix Studio Pro (Latest version) and convert the app to the latest version, I get 367 errors. As I am not an expert, I have no idea how to fix them. It seems like there are connections broken because of missing attributes. Can you tell me what I can do to fix the problems?   Thank you in advance. Best regards  
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