ขอความช่วยเหลือด่วนครับ Loader.php error Warning: is_readable() [function.is-readable]: open_basedir restriction in effect

 public static function isReadable($filename) {
        if (is_readable($filename)) {
            // Return early if the filename is readable without needing the 
            // include_path
            return true;
        }

        foreach (self::explodeIncludePath() as $path) {
            if ($path == '.') {
                if (is_readable($filename)) {
                    return true;
                }
                continue;
            }
            $file = $path . '/' . $filename;
            
            if (is_readable($file)) {
                return true;
            }
        }
        return true;
    }