"An unexpected error has occurred" when clicking on Choose Picture button in Edit User Profile within Central Admin

1. One thing the guide doesn't mention is to note your Preferred Search Center URL which in my case is http://intranet/search/pages.
Go to Application Management > Manage Service Applications > User Profile Service > Setup My Sites
Enter this URL under "Preferred Search Center".

2. Run IISRESET /noforce

3. Go back to User Profile Service in step 3, and click "Start Profile Synchronization" and then a full sync.

4. At this point you should be able to click on Choose Picture without getting that cryptic error.