Unhappy Encryption Unsuccessful Error

I recently encrypted my phone. It worked fine, but it was causing some issues for me when I tried to transfer pictures to my computer over USB, so I tried to disable it, but afterwards I got an error that says 'Encryption Unsuccessful', and my only option is to 'Reset phone'(which does nothing).

I've done a lot of searching but have been unable to find anything that has helped me resolve this issue. The phone was not rooted. Is there any way of fixing this?