Yearn contract learner

Hi all, I am newer in learning smart contract and I have met some issues when deploying the yearn contract for learning.
I followed the step of Andre’s article( but it fails to deploy through remix. And the issue is “gas required exceeds allowance (8000029) or always failing transaction”.
Some answers to this problem are the code issue of the contract. But I think Andre did a great work and it is not likely the issue from code. I think maybe there is an operation error from me. : |
please give some tips! thx in advance.

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