how do you fix 404 error,with craigslist.austin tx

I ADVERTIZE ON CRAIGSLSIT AUSTIN ,TX..HOWEVER FOR SOME REASON (LATELY),I CAN'T GET MY POSTING TO POST..CONTINOUSLY TOLD NOT VALID POSTING ID #,,OR 404 ERROR.PLEASE HELP.DON

Hi,

1. Have you made any recent changes on the computer?
2. Which web browser are you using to access the website?
3. Do you face similar issue on any other website?

Method 1

Try the below steps only if you are using internet explorer.

Error 404 occurs when Internet Explorer is able to connect to the website, but the webpage is not found. This error is sometimes caused because the webpage is temporarily unavailable or because the webpage has been deleted.

 I would suggest that you reset internet explorer settings to default and check if it helps.

For more information refer the article.

How to reset Internet Explorer settings

http://support.microsoft.com/kb/923737

Important: Reset Internet Explorer to its default configuration. This step will also disable any add-ons, plug-ins, or toolbars that are installed. Although this solution is quick, it also means that, if you want to use any of those add-ons in the future, they must be reinstalled.