iphone attachment size of an image

In my applications, I am attaching a 3000 x 3000 (px) image rougly 3.0 MB. I usually get an e开发者_如何学运维rror in logs: ": Could not write any more data to the consumer"

Also, I get memory warning and sometimes the app crashes, though i am releasing as much memory as possible if there's a warning.

So I just want to know that what does ": Could not write any more data to the consumer" means.

I have googled it, but I couldn't find anything related.