i was doing an MVC project, about budget, using user, transactions, account, account type, operation type and category, those are my tables in sql, the problem is that i was doing the CRUD on the transaction controller, i was doing the create.cshtml to see if a new transaction is created, but have an error on the creation,i left two images []

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I am trying to understand about the problem, so i can solve it, because i was understanding everything on the problem, but i am stucked here, and i can’t continue.
My code