Picture Upload Error

Hi there,

Site is https://www.onebyonethemovie.co.uk, Omega Child Theme…

Every time I upload an image, I can upload it, but when it gets to crop section (so I can put it in place) it doesn’t let me crop it and then I get the error message:

Uc.jgp
There has been an error cropping your image.

I know its not the image, as it happens on every image, even one I have put on another website.

Please can some one help?

Thanks in Advance…