Error message about referring to a private field from a super class could possibly be improved

Consider this source code:
---
public class O {

    private final int i = 0;

    static class I extends O {
        void test() {
            System.err.println(i);
        }
    }
}
---

Compiling this code on "1.8.0-b132" yields:
O.java:7: error: non-static variable i cannot be referenced from a static context
            System.err.println(i);
                               ^
1 error

While the code is correctly rejected, the error message causes confusion. Possibilities to improve it should be evaluated.