Just noticed this pop-up. I gave it a look and found some flag counters just don't work for some reason? It may be worth a shot to try a different flag counter. This one has worked for me following my instructions, but this one doesn't. Not quite sure why. The second one has worked in the past, I even used it when I wrote those instructions.
The coding looks the same from what I remember, but I can't code (I know bare basics). Idk if it's something to do with the coding, my instructions (though they seem to still work with others, so I assume that isn't the problem), if MDL just doesn't recognise it anymore or if it's just the flag counter website itself.
Sorry, I can't help you guys much. xp