Here’s the specific error:
Fatal error: Call to undefined method WP_Image_Editor_Imagick::get_error_message()
I just did some digging around and found this might happen when an image is uploaded as your featured image that isn’t a JPG or PNG – maybe you can check that?
If that’s the case, that’s very strange and I’ll have to find a workaround for that.
Let me know 🙂