I\'m getting some of these prints in my console while running my application from Xcode 6 in my iPhone 6 with iOS 9 beta 5:
CoreData: Failed to load o
I ran into this problem this morning. Did a small hack to get it running. I think it's got something to do with versioning mismatch but I'm not sure.
Anyhow, if you're loading a momd-file, just append a "/[filename].mom" to the NSURL to get it working.
In my case, I was loading the file Countly.momd and ended up doing this:
// Original loading
NSURL modelURL = [[NSBundle bundleForClass:[CountlyDB class]] URLForResource:@"Countly" withExtension:@"momd"];
// Small hack
modelURL = [modelURL URLByAppendingPathComponent:@"Countly.mom"];
Update: I was using a POD that used CoreData. Removing the pod and adding the source etc. from repo directly made the problem go away.
So it might be a pod-issue.