What exactly is the error you are getting. It is normal for a post not to appear straight away and sometimes it wont appear at all as they'll send the reason to the email address linked to the account.
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Sorry this didn't help.
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All forum posts are moderated before they hit the actual forum. What this means is that when you post it goes into a queue and waits to be looked over and approved by a moderator. So be patient, it'll appear in time. Due to the volume of posts, it may take
up to 24 hours for yours to be processed.
It’s been over 24hrs, why don’t I have a reply yet?
Some forum questions are handled outside of public view for your own privacy protection. The way this is done is that the post is deleted and the moderator's reply will be emailed to the account associated with the tag you're posting from.