Uploading images error

I’ve been adding images to posts with no problem for several weeks. Now, when I try to upload an image I get this error:

“Fatal error: Out of memory (allocated 30932992) (tried to allocate 10944 bytes) in /homepages/11/d156680903/htdocs/blog/wp-includes/media.php on line 258”

Anyone have any suggestions? Thank you.