Tutorial would be welcomed as this solution used by people that say they want to use their own different image in the full view, is not working for me. Image is simply being duplicated in category/post summary page. 1 image is coming from the post and 1 image is featured.
Regarding the error, I inserted an image into post, selected aside format and error is there. Here is how it looks exactly: http://www.netrpimnepravdu.rs/izmena-pravilnika-zdravstveno-osiguranje/ Like I said, didn’t modify content-aside.php so am confused where it’s coming from.
p.s. It seems that all other of my posts show the same error if aside format selected.