Xcode – App suddenly will not run on device

1. Go to Targets in Xcode.
2. Build Settings on your project's target (your current development name).
3. Search for Product Name under Packaging. Change its value to what you want your new project name to be.

Finally, after two days trying to solve this issue, I've found the solution here:

How to create the magic .xcdatamodeld folder / package?

I'm now finishing a project that other developer started, and it seems that he didn't pushed the latest changes to the repo, but those changes were in the app in the device, and when I removed the app I deleted the right .xcdatamodeld file. The problem was that I had just a MyApp.xcdatamodel file in the project, and this was the reason of having a momd empty folder, it seems.

In order to create the right hierarchy of data model, the solution was quite easy:

1. Select the MyApp.xcdatamodel
2. Go to Editor > Add Model Version...

And this embedded the MyApp.xcdatamodel file into MyApp.xcdatamodeld. Now the momd folder has the mom files and the app runs OK. The only problem now is that I have two MyApp.xcdatamodel, one with a green selected icon, but both with the same content so no problem.