ReferenceError?

Question

Python

Hello, tell me why it gives this error. In general, I describe the problem. The Image
widget to which the source property is bound via a kv file contains an image with a resolution of gif . In the code, when you try to change the image to another, it pops up: return self.proxy is not None and not bool(dir(self.proxy)) ReferenceError: weakly-referenced object no longer exists I understand this means that I refer to a weak reference? Why is this happening and how to fix it? I will say that I write the path to the image completely, and he even changes it, but then this error immediately pops up