Hi @zaid22, thanks for reporting this observation.

I was unable to replicate this behavior. This could have been caused in two ways:

1. You used the wrong posting or active key because post authority errors are keys related. But this is unlikely since you were able to make this post.
2. The content you wanted to submit was copied and pasted in the edit box, and may just have had some unsupported symbols.

Number two is hard to find, you'd need to read the text line by line to find them or you can use a text editor capable of highlighting this hidden characters, try sublime for instance. Delete this characters then try pasting and submitting the post again.

Or you can run another check by writing a whole new post instead of copying and pasting.

I apologise for any inconvenience encountered as a result.