App crashes on Samsung Galaxy S5 (Read-only file system)

For some reason my app crashes abruptly on launch on Samsung Galaxy S5. On all other Android devices I have tested, it works fine.

This is the error I get:

Failed to mkdirat(/storage/extSdCard/Android): Read-only file system
Failed to ensure directory: /storage/extSdCard/Android/data/com.***.***/files

I’m using Unity 4.5.2f1 and I have selected Write Access: External (SDCard) in the player settings.

Anyone has an an idea?

I am having the same crash with my S5 with vlc running on udp port as below:
02-15 09:17:31.336 E/SELinux (29199): [DEBUG] get_category: variable seinfo: default sensitivity: NULL, cateogry: NULL
02-15 09:17:31.336 I/art (29199): Late-enabling -Xcheck:jni
02-15 09:17:31.406 D/TimaKeyStoreProvider(29199): TimaSignature is unavailable
02-15 09:17:31.406 D/ActivityThread(29199): Added TimaKeyStore provider
02-15 09:17:31.456 D/ResourcesManager(29199): creating new AssetManager and set to /data/app/org.videolan.vlc-1/base.apk
02-15 09:17:31.506 W/ContextImpl(29199): Failed to ensure directory: /storage/extSdCard/Android/data/org.videolan.vlc/cache
02-15 09:17:31.506 W/ContextImpl(29199): Failed to ensure directory: /storage/extSdCard/Android/data/org.videolan.vlc/cache
02-15 09:17:31.526 W/linker (29199): libvlcjni.so has text relocations. This is wasting memory and prevents security hardening. Please fix.
02-15 09:17:31.566 D/VLC/JNI/main(29199): JNI interface loaded.
02-15 09:17:31.566 V/VLC/LibVLC(29199): Initializing LibVLC

Anyone expert can help in here???

Thx!
Ruthy

apparently unity doesn’t want to answer this one… happens to my app too. only on s5
edit: I’m not using VLC, rather my app is cardboard vr game. No error just home screen.