It's an incompatibility between PhoneGap and XCode 4. To resolve:
- right click on your project and choose "Add files to [project
name]...";
- choose the
www
folder from your curent project's folder (it's
included in there, but not added as a reference);
- when you select the folder, make sure you choose "Copy items into
destination group's folder" as well as "Create folder references for
any added folders".
Note: if you choose "Create groups for any added folders", the app will still fail at runtime.
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