Google Webmaster Tools crawl errors due to Google decoding links that were urlencoded by Codeigniter
In our pages we have internal links that are urlencoded because the URL may sometime contain special characters such as () or ! So in our source code we have a link: ...
Our site is using Greek characters for some pages. So in Webmaster Tools -> Crawl -> Crawl Errors, the URLs are shown in a format like: ...