[fw-mvc] Odd Zend_View Error: Failed to open stream, no such device in....

ZF 1.8.4

I am getting this weird php warning from my login and index controllers:

*************************
Warning: include(/home1/myusername/invoicing/views/)
[function.include]: failed to open stream: No such device in
/home1/myusername/Zend/View.php on line 107

Warning: include() [function.include]: Failed opening
'/home1/myusername/invoicing/views/' for inclusion
(include_path='.:/home1/myusername') in
/home1/myusername/Zend/View.php on line 107

************************

I have another controller I use often too, but the error is not
generated when that controller is in use. I have tried to compare the
three controllers to find the discrepancy, but I'm not finding it. Any
ideas? The warning indicates that ZF is trying to open a directory as
opposed to a valid file. This has me really confused. Any ideas?
--
Regards,
Nathan @ T&R Trailer Sales

Tel: 719-546-2321
Fax: 719-404-4697