Hi,
That’s odd. Well, I had this issue at the beginning, but clearing the cache did the trick for me. However, I found this post, but that also doesn’t seem to be the case because the domain and directory name are the same (blinds_controller).
The files look good, and I just redownloaded the whole project to double-check if something is wrong, but I can’t replicate this issue. As shown in the picture below, it works.
But there is one more thing we can check: if you can access the logs (home-assistant.log). Perhaps we can find more information there.