debug notice on my WordPress site [closed]

In your config.php
check for 

define( 'WP_DEBUG', true );
define( 'WP_DEBUG', false );

If its true, you will see notices and warnings on site.

This link might be useful http://codex.wordpress.org/WP_DEBUG.

Also check this error by logging in and logging out. If you are using any plugin for debugging, you will see that notice message when you are logged in.

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error code: 523