PHP require, require_once errors

If you an error that looks like one of these...

Warning: require_once(/home/username123/public_html/amember/ [function.require-once]: failed to open stream: No such file or directory in /home/username123/public_html/amember/rconfig.php on line 19
Fatal error: require_once() [function.require]: Failed opening required '/home/username123/public_html/amember/' (include_path='.:/usr/lib/php:/usr/local/lib/php') in /home/username123/public_html/amember/rconfig.php on line 19

This error is saying that the file in /public_html/amember/ doesn't exist, or isn't readable. Check and see if this file exists. If it does, check the permissions on this file to make sure they are 644 or 755.

The file /public_html/amember/rconfig.php is simply the PHP file that tried to call "". The PHP script must call the file by its exact name, or you will get this same error.