在编写realm数据库相关时：

代码：

  List<Student> delByStudent(String priNum){
        RealmResults<Student> studentsList = myStudentRealm.where(Student.class).equalTo("num",priNum).findAll();
        for (int i = 0;i<studentsList.size();i++)
            studentsList.deleteFirstFromRealm();
        return studentsList;

在for的循环语句

studentsList.deleteFirstFromRealm();

报错：