This shouldn't happen, but I'm gonna need more context on what's happening. Do you get that message (error) when trying to post something, make a comment in that thread? What exactly are you writing on your comment/post - do you think you could try either posting it in this thread or sending it through PM to me?
In case your post contains some non-latin unicode elements, it could be our anti-spam measures trying to prevent posts similar to spam. But ideally that shouldn't happen. Maybe try sending/posting it in parts so that we can identify why you're not being able to post it. Like I said, we're gonna need a little more context to work with.