Using php includes in the functions.php file. Not working. Help!

I’m building a theme with some custom post types.

Normally all of these functions would just go in the functions.php file but I decided to make each post type function in a separate .php file.

Basically in my functions.php file I have.

<?php include('filename.php'); ?>
<?php include('filename2.php'); ?>


For some reason when there is two includes in the file neither work. But when there is only one inside the file it works. I tested both as just a single include and they both work fine. I’m lost…

Anybody know what’s going on here?

Thanks,
David