I get this message like this : Your ad was disapproved because your landing page URL returned a 503 status code, which indicates an error. I don't understand how to fix my website. I don't find any error. What is the meaning of that message? Thanks
503 means server is unavailable - this is usually a temporary state. It could be that the server was down when the adwords bot came to your site. You should try to re-submit the ad and if the same thing happens, then you should approach your hosting company and ask them to resolve this issue.