Problem with robots.txt file in google adsense?

robots.txt is a text doent which is placed in the root of your website. It describes which files and folders a search engine may index. By adding the lines you mentioned, Google would be allowed to index all the files and folders on your website. Add the lines you mentioned to your robots.txt file and you are done. If you cannot find a robots.txt file, you can simply create one yourself and add the lines you mentioned to it. Upload the file to the root of your website and you are done.