AttributeError: 'Annotation' object has no property 'FontProperties'

This error occurs when you try to access the `FontProperties` property of an `Annotation` object, but this property does not exist for this type of object.

To fix this error, you need to check the documentation of the `Annotation` object and see if it has a different property that you can use to customize the font properties. Alternatively, you can create a new `Text` object with the desired font properties and add it to the plot instead of using an `Annotation` object.