To switch from UE5.0 to UE5.1 I have done the changes already:
Android Studio: Install the NDK 25.1.8937393
Android Studio: SDK Platform to 29 (Quest 2 is Android 10)
Android Studio: Android SDK Tools to 30.0.3
Android Studio: Command-line to 8.0 latest
Android Studio: CMake to 3.10.2.4988404
SetupAndroid.bat to Update SDK
UE5.1: Settings, Platforms, Android SDK change the NDK path
UE5.1: Settings, Platforms, Android change Target SDK Version to 29 (Android 10)
UE5.1: Platforms (Launch), Android, Quest 2 do Update Device and restart UE to get SDK Managment “Installed: r25b”
To make sure it works, I tried the default UE5.1 “Blueprint Virtual Reality Template” and it works.
So NDK is fine.
But compiling VRExpPluginExample I get the posted error message.
Thanks for your advice and uploading a revised version.