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There are several reasons why a white screen could appear on React Native navigation:

Incorrect implementation of navigation: If navigation is not implemented correctly, it can lead to a white blank screen. For example, navigation may not be set up correctly with the necessary screens, or the routes may not have been defined properly.
Issues with the emulator or device: There may be issues with the emulator or device on which the app is being tested. The emulator may not be properly configured or running, or the device may be running out of resources like memory or storage.
Incorrect or incomplete code: There may be issues with the code that is used to build the app. For example, there may be syntax errors, unused code may be causing conflicts, or there may be missing dependencies or libraries that the app requires.
Incorrectly set or missing permissions: Permissions may not be correctly set or may be missing, causing the app to fail to open correctly. This is especially true if the app needs to access resources like the camera or microphone.
Problems with external libraries: The app may be using external libraries that are not properly configured or have bugs, causing the app to crash or display a white screen.