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This issue means that the PSPDFKit.bundle can't be found or is outdated. Make sure you've added a version of the bundle that came with the version you're currently using PSPDFKit with.
Xcode sometimes also holds on to caches, so to be 100% sure, follow these steps:
- Perform "Clean" on your project
- Delete Xcode's DerivedData folder
- Delete Xcode's build folder
- Reset the iOS Simulator or if you deploy on device, delete the old app.
- Build again and see if the issue is still there.