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The ITMS-90171 error occurs when the app's bundle structure does not meet the app store's requirements. This can happen if essential files or folders are missing or if there are duplicate resources within the bundle. The App Store Connect uses a strict validation process to ensure that apps meet the required standards before they can be uploaded, and any errors in the bundle structure can cause the upload to fail. This error can be frustrating for developers who have put in a lot of effort to build their app, but it is a necessary step to ensure that the app is safe and functional for users.