Minifrontpage error: 0 - The image file does not exist.

I think I found the reason of the error. It looks like the module doesn't work properly with image that contains spacing in its file name. It happens when you add the image directly using the wysiwyg editor, but it works properly when you use Intro image or Full Article Image to add image to the article.
I'll try to fix it, but temporarily, if you want to to add image directly from editor, please remove spacing in the your image filename first.