inteceptor cannot use in Dio?

Question

I follow the Doc, but get some error.

Answer 1

It would be useful if you repeated the error you get, but I'll make a guess at what the problem is.

The text dio.interceptor is not inside any function, constructor or variable initializer. You can only have expressions in those places, not at the top-level of a library.

At the point where you write dio.interceptor, you need to write a variable or function declaration. There is no valid declaration starting with dio.interceptor because it cannot be a type, so the analyzer will tell you that the program isn't valid and, likely, that a type is expected.

Whatever you are trying to do, put it inside a function, perhaps even a main function if this is the main file of your program.