An error occurred in the upload. Please try again later.

I’m working on a wordpress site that users need to upload large images to and I keep getting this error
An error occurred in the upload. Please try again later.
it’s a 2mb jpg rgb 72dpi
I changed the media settings so it can handle this I changed the permissions to my upload folder, I deactivated my plugins but nothing? I think it’s a WordPress error, should I roll back to an older version?
Any advice would be appreciated.
Cheers.
Chris