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If this issue occurs, it means that the PSPDFKit.bundle either can’t be found or is outdated.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 also sometimes holds on to caches, so follow these steps to clean them:

  1. Perform “Clean” on your project.
  2. Delete Xcode’s DerivedData folder.
  3. Delete Xcode’s build folder.
  4. Reset the iOS Simulator, or, if you deploy to a device, delete the old app.
  5. Build again and see if the issue is still there.