Errors when submitting a post

I am using 2.7.1. Could someone please explain how to resolve these errors that I get when submitting a post:

Warning: getimagesize() [function.getimagesize]: URL file-access is disabled in the server configuration in /pathto/www.example.com/wp-content/themes/monotone/functions.php on line 109

Warning: getimagesize(https://www.example.com/wp-content/uploads/2009/05/l-1600-1200-1faea376-5741-419d-92cb-22b6b494b69b.jpeg) [function.getimagesize]: failed to open stream: no suitable wrapper could be found in /pathto/www.example.com/wp-content/themes/monotone/functions.php on line 109

Warning: imagecreatefromjpeg() [function.imagecreatefromjpeg]: URL file-access is disabled in the server configuration in /pathto/www.example.com/wp-content/themes/monotone/functions.php on line 235

Warning: imagecreatefromjpeg(https://www.example.com/wp-content/uploads/2009/05/l-1600-1200-1faea376-5741-419d-92cb-22b6b494b69b.jpeg) [function.imagecreatefromjpeg]: failed to open stream: no suitable wrapper could be found in /pathto/www.example.com/wp-content/themes/monotone/functions.php on line 235

Warning: imagesy(): supplied argument is not a valid Image resource in /pathto/www.example.com/wp-content/themes/monotone/functions.php on line 237

Warning: imagesx(): supplied argument is not a valid Image resource in /pathto/www.example.com/wp-content/themes/monotone/functions.php on line 239

Warning: imagecolorat(): supplied argument is not a valid Image resource in /pathto/www.example.com/wp-content/themes/monotone/functions.php on line 251

Warning: imagecolorat(): supplied argument is not a valid Image resource in /pathto/www.example.com/wp-content/themes/monotone/functions.php on line 252

Warning: imagecolorat(): supplied argument is not a valid Image resource in /pathto/www.example.com/wp-content/themes/monotone/functions.php on line 253

Warning: imagecolorat(): supplied argument is not a valid Image resource in /pathto/www.example.com/wp-content/themes/monotone/functions.php on line 254

Warning: imagecolorat(): supplied argument is not a valid Image resource in /pathto/www.example.com/wp-content/themes/monotone/functions.php on line 255

Warning: Cannot modify header information – headers already sent by (output started at /pathto/www.example.com/wp-content/themes/monotone/functions.php:109) in /pathto/www.example.com/wp-includes/pluggable.php on line 850

(Path and domain intentionally obfuscated for the purpose of this post.)