Can’t Upload Images

I’ve had my blog for two years, and all of a sudden I can’t upload images anymore. I get the following error message:

Warning: move_uploaded_file(): Unable to move ‘/tmp/phpEoqiER’ to ‘/home/lashawnb/public_html/images/mcnabb_01.jpg’ in /home/lashawnb/public_html/wp-admin/upload.php on line 123
Couldn’t upload your file to /home/lashawnb/public_html/images/mcnabb_01.jpg.

I go to the file and check line 123: $moved = move_uploaded_file($img1, $pathtofile2);

I have no idea what’s supposed to be wrong with it. I haven’t been tinkering with the file at all.

Suggestions?