The preferred method is to post it in the Website Whines section of the forum, this will then inform other users of the error therefore we will not be swamped with the same error from multiple users.
However if this is not possible contact us via the onsite form provided.
Please give us as much information about the problem as you can i.e. what were you doing at the time? What browser were you using, what version is it plus any other relevant information.
