after install: error in functions.php line 326

Hello,

I started using WP today and want to build a website using the spun theme.

When activating spun theme, I got this error messages that persists in the header of my dashboard:

Warning: include_once(includes/custompost.php) [function.include-once]: failed to open stream: No such file or directory in /[…]/wordpress/wordpress/wp-content/themes/spun/functions.php on line 326

Warning: include_once() [function.include]: Failed opening ‘includes/custompost.php’ for inclusion (include_path=’.:/usr/local/lib/php’) in /[…]/wordpress/wordpress/wp-content/themes/spun/functions.php on line 326

I could not find any helpful hints here or online, and my provider said I must turn to the theme’s support.

Thank you