I get this error on a lot of aosp ROMs lately when I try to send MMS messages. I'm on slim ROM now (4/28 build) and I've tried the normal fixes like clearing data in the messaging app, fixing permissions and wiping cache and dalvik. Anybody got any ideas on how to get rid of that error and how to send pics again? I'm also getting another error unique to slim because I've never seen it before. Every time I open the messaging app I get a little message pop up that says "can't download now please try again later". It doesn't affect anything. It's just there.