Find the error in this code related to the diamond problem:

Find the error in this code related to the diamond problem:

class A:
    def greet(self):
        print('Hello from A')

class B(A):
    def greet(self):
        print('Hello from B')

class C(A):
    def greet(self):
        print('Hello from C')

class D(B, C):
    def greet(self):
        C.greet(self)

D().greet()