Photos stopped uploading to iCloud Photos
I am trying to upload ~10,000 photos from my iPhoto library (which is on an external hard disk) to iCloud Photos. Over the course of 9 hours, ~2,000 photos were uploaded, and then it stopped with 7,573 photos left to upload. I tried quitting Photos and restarting several times, but it's still stuck on that number. I then unchecked "Photos" in the iCloud settings to try to unsync and then resync, and got the following error message:
I have plenty of iCloud space left and my internet connection is intact. The iPhoto library was created when I was on Mavericks, and I am now on Yosemite. Can someone please help?
iPhone 5s, iOS 7.1.2, null