Error when trying to post a thread why?

So I made a thread and when I go to post it, I get an error, just says the site experienced an unexpected error please try later?
I tried yesterday and today still nothing?

Same thing had been happening to me

I have this problem sometimes when I post using my mobile phone. I tried different browser or did simpliest post to avoid this error.

I get an error if I try to post emojis (not just on this forum but others, as well). Maybe one of the characters that you used isn’t allowed?