Can't save in dueling-grounds : Solved

In the level, I’ve got this popup and the code is not saved:

I don’t see any popup in your post, did you forget to include the picture?
EDIT: I don’t see the picture, but when I try to edit your post, I can see there is a link and I see the picture in the preview? Bug with the forum…

The image is quite long. But I see it in my post above.

How about now (after a cache clear)? I think I have fixed it.

yes it’s solved. Thanks Nick.