CFBundleVersion in the Info.plist Upload Error

Question

"The binary you uploaded was invalid. The key CFBundleVersion in the Info.plist file must contain a higher version than that of the previously uploaded version."

I’m getting this error when I come to upload my application.

I set the updated version to 1.2 on iTunes Connect and have also updated the .plist file to 1.2.

I don’t understand why I am getting this error. Any help would be appreciated. Thanks.