Magazine 2.3.3 header error

I added a header image to my magazine 2.3.3 (http://toddmorrill.com)and get this error:

Warning: getimagesize() [function.getimagesize]: URL file-access is disabled in the server configuration in /nfs/c04/h02/mnt/63542/domains/toddmorrill.com/html/wp-content/themes/magazine-basic/functions.php on line 108

Warning: getimagesize(http://toddmorrill.com/wp-content/themes/magazine-basic/uploads/aagreylogo.png) [function.getimagesize]: failed to open stream: no suitable wrapper could be found in /nfs/c04/h02/mnt/63542/domains/toddmorrill.com/html/wp-content/themes/magazine-basic/functions.php on line 108

Is it because it expects the header image size to be different? What does size does it want?

Todd