Error Message

I’m getting the following error messages when I run the ‘test config’ on the set-up screen. How do I fix it? Thanks.

Warning: include_once(/usr/home/xphotog/domains/xristiansimon.com/public_html/site/wp-config.php) [function.include-once]: failed to open stream: No such file or directory in /usr/home/xphotog/domains/xristiansimon.com/public_html/site/wp-content/plugins/postie/postie_test.php on line 4

Warning: include_once() [function.include]: Failed opening ‘/usr/home/xphotog/domains/xristiansimon.com/public_html/site/wp-config.php’ for inclusion (include_path=’.:/usr/local/lib/php’) in /usr/home/xphotog/domains/xristiansimon.com/public_html/site/wp-content/plugins/postie/postie_test.php on line 4

http://wordpress.org/extend/plugins/postie/