Add self to method definition; sorry I forgot to test before commit the previous changeset.
Add self to method definition; sorry I forgot to test before commit the previous changeset.

yungyuc/solvcon,solvcon/solvcon,yungyuc/solvcon,solvcon/solvcon,solvcon/solvcon,yungyuc/solvcon,yungyuc/solvcon,yungyuc/solvcon,solvcon/solvcon,yungyuc/solvcon,solvcon/solvcon,solvcon/solvcon