No upload image from Option Panel

Hi!
I’ve tried to upload a new image from Option Panel, and I don’t know, suddenly, it doesn’t let me do it. Appears the following error: “Unfortunately, the page you tried accessing could not be retrieved”.

And my page is without that image. Mi page is: https://suculaff.com/, and the image that is empty is which I treat to change.

Any idea?

Thanks so much in advance!