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There can be multiple reasons for your application to crash after creating a directory in Android 9.

One possible reason is permissions. Android 9 introduced strict permissions for accessing storage. If your app does not have the necessary permissions to access external storage, it may crash. You can try adding the necessary permissions in your app's manifest file or request runtime permissions from the user.

Another possible reason is incorrect file paths. If your app is not able to locate the directory created, it may crash. Double-check the file paths and ensure they are correct.

Additionally, you may want to check for any errors in your code that may be causing the crash. Use Android Studio's debugging tools to identify and fix any issues.