Find the mistake in this code:

Find the mistake in this code:

class Student:
    def __init__(self, grade):
        self._grade = grade

    @property
    def grade(self):
        return self._grade

    @grade.setter
    def set_grade(self, value):
        if value < 0 or value > 100:
            raise ValueError('Invalid grade')
        self._grade = value