This is bad design and not intentionally deceiving.
!crappydesign@sh.itjust.works
This might actually be helpful. The fact that it's just the word "Error" in red could be just the clue the developer needs. You don't know.
ERROR: An ERROR has occurred. Please correct this ERROR.
It used to show the type of error, like couldnt_find_post. It was changed and now it returns Error for everything. How is that helpful?
Well, your original post lacked that context.
I assume this is in a browser. You might have more luck checking the network protocol. Press F12 (Windows/Linux and Firefox/Chrome; don’t know about Apple) to open the dev tools. Open the network tab, and retry your request. One of the new lines in the log should be red. Click that and check “Response”.
AssholeDesign
This is a community for designs specifically crafted to make the experience worse for the user. This can be due to greed, apathy, laziness or just downright scumbaggery.