1ReferenceError: undefinedsub-class must call super before use 'this' 2ReferenceError: undefinedsub-class must call super before use 'this' 3ReferenceError: undefinedsub-class must call super before use 'this' 4ReferenceError: undefinedsub-class must call super before use 'this' 5ReferenceError: undefinedsub-class must call super before use 'this' 6ReferenceError: undefinedsub-class must call super before use 'this' 7ReferenceError: undefinedsub-class must call super before use 'this' 8ReferenceError: undefinedsub-class must call super before use 'this' 9ReferenceError: undefinedsub-class must call super before use 'this' 10ReferenceError: undefinedsub-class must call super before use 'this' 11