Honestly I can't tell what the picture is supposed to show, doesn't say anything about jsp.
I'm just going based off of what I'm witnessing right now and what I have in the past.
So when you try to paste an image into your post, d2jsp backend tries to talk to imgur and say 'hey upload this image and give me the url'. However if you do this too many times and your account isn't allowed to make that many requests imgur will say 'no you've posted too many images already'.
The image is if you look at the networking response between jsp and imgur, the 429 error is very clear in what the issue is.