Same also with me. I had tried to visualize the code that you provided and same error. However, the link is good and the image is visible to Imgur app.

In my case, I do not have experience anything that gone wrong using Imgur app copied and paste the link. Do this problem coule be about the Imgur or the BCT?

Anyway, I think you have uploaded a different file already and then copied and paste Imgur image link to bct that is working fine already.