If your web application uses a function found in a particular file, but the application says that the function does not exist, then the file was probably corrupted during the upload process, or during the download process from the software vendor's website. The best way to correct this is to redownload the software package from the vendor's website, and then reupload the corrupt file.
Page says function not found, but the page exists
If you are using a forum or content management system, make sure that caching is enabled. Caching...Cannot connect to database
This error will occur within a web application when any of the following conditions are met:...I'm receiving a blank page
If your website or web application is displaying nothing but a blank, white page, then chances...Page is displaying 404 Page Not Found error
The 404 Page Not Found error means that the user requested a page on the server that does not...Files fail FTP transfer
When uploading many files at once (a CMS, for example), it is not uncommon for a few of the files...