Error on installation The configuration file /includes/config.php is not writeable. Please chmod the includes directory to 0777 and then try it again. there is no such a files in /includes/ I am installing rc3
Yes, because the /includes directory is not writable. The installer will write the config.php file to that directory. See also step 3 in the FTP installation guide: How do I install Contenteller with a FTP client?