PSPDFKit needs various resources to work. This includes images, character maps, localization files and other resources.
If your setup is unusual (e.g. using the Appcelerator Titanium plugin), you can also manually drag the bundle into your application. It should be in your application bundle, but valid locations are also
PSPDFKit will display both log warnings and, if a debugger is attached, also an alert if there is an issue with the resource bundle:
The bundle is also internally versioned to make sure you don't use an old bundle with a new version, in that case you might see a variation of the error asking to update the bundle.