Identify the error in this code snippet:

Identify the error in this code snippet:

class Vector:
    def __init__(self, x, y):
        self.x = x
        self.y = y
    def __add__(self, other):
        return Vector(self.x + other.x, self.y + other.y)
v1 = Vector(1, 2)
v2 = Vector(3, 4)
print(v1 + v2)