asp.net core mistakes trying to add razor page for a web app?

i followed the following instruction to try to build a demo web app, however, it show me mistakes

https://docs.microsoft.com/en-us/aspnet/core/tutor...

the razor type i try to add need a primary key, but i do have(code is not enough to be contained in yahoo) declared an id called id in my person Class

what are the problems and how to fix it

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