Appzi - Feedback widget is not showing images

Hi everyone,
I started using a feedback widget from appzi.com and having trouble with images of the feedback. Widget allows user to give a feedback at any screen and adds the screenshot of the screen to the feedback itself. Unfortunately I get following error about screenshot of the page,

I installed the widget with just the two lines of script code to the header, from general settings, but I tried at the page level too, it gives me same error. Anyone had similar problems with external widgets like chatbots?