Why does it give me such an error?

Question

visual studio

Why does it give me such an error?

spoiler

I mean that I understand what is wrong. But why doesn't visual studio write a sintax error, namely such an incomprehensible error. And if I have 1000 lines of code, I won't be able to find the error

Answer 1

First, clean up and completely rebuild the project. The second is a window with build errors.

Answer 2

Apparently, the error occurs during the compilation of the project and the environment does not find errors in the code, as they occur during the compilation of the code. Start debugging the code and look at which line the compiler stops and what it writes.