When I open the source code file 08 - Improved Data Model I get the following error message:
fatal error: unexpectedly found nil while unwrapping an Optional value
This actually happens on all source files in 08, 09, 10.
11 - Local Notifications works fine.
The highlighted code is in DataModel.swift line 42
lists = unarchiver.decodeObjectForKey(“Checklists”) as! [Checklist]
However, that line is the same in 11, but does not throw an error.
Any suggestions?
Does Xcode throw a red or yellow warning on that line? It should if you are using the latest version.
This happens when your Checklists.plist file has different things in it than the code expects. That’s why the tutorial instructs you to remove this file a few times, whenever you add new features to the app. Try removing Checklists.plist, then run the app, add some new to-do items, and go to home screen. The next time you launch the app it should not give the error.
