[C#] Inconsistent accessibility

Phenomenon

In C #, the following code causes a title compilation error.

This error occurs when, for example, the class is private but the method is public, but in this example both are public.

public class MyClass{

    public MyClass(OtherClass data){ //error here
        //omit
    }

Cause and Solution

The constructor argument OtherClass was private.

When I changed this to public, the compile error disappeared.

It was a trivial error, but it was a blind spot because I was only concerned about the accessibility of class and method.