Thumbs recent post widget not showing

Hello,

I’m using the Meeta theme by WPZoom and I’m having problems with the recent posts widget. It works fine except for the thums that should be showing. I can choose wether to show them or not, but when I select to show, it doesn’t work. Just a red cross. The rest of my images seem to load fine. I have set all the permissions, but it isn’t helping.
Anyone got any ideas? https://bit.ly/HIZWL4