Build error (failed to re-package resources) for no apparent reason

I'm using CloudOnce, which is a simple to use Google Play Games asset. I've been able to build my game just fine before, but all of the sudden I have build error. I don't know what caused it, because I didn't change anything significant in Unity since the last build.

CommandInvokationFailure: Failed to re-package resources. See the Console for details. G:\Android\build-tools\24.0.0\aapt.exe package --auto-add-overlay -v -f -m -J gen -M AndroidManifest.xml -S "res" -I "G:/Android\platforms\android-24\android.jar" -F bin/resources.ap_ --extra-packages com.google.firebase:com.amazon.ags:com.google.android.gms:com.google.example.games.mainlibproj:com.google.android.gms.auth:com.google.android.gms.base:com.google.android.gms:com.google.android.gms.drive:com.google.android.gms.games:com.google.android.gms.nearby:com.google.android.gms.tasks:android.support.v4:com.unity3d.ads.android -S "C:\Users\mreso\Documents\Falling Delivery\Temp\StagingArea\android-libraries\firebase-common-9.0.2\res" -S "C:\Users\mreso\Documents\Falling Delivery\Temp\StagingArea\android-libraries\gamecircle_lib\res" -S "C:\Users\mreso\Documents\Falling Delivery\Temp\StagingArea\android-libraries\google-play-services_lib\res" -S "C:\Users\mreso\Documents\Falling Delivery\Temp\StagingArea\android-libraries\play-services-auth-base-9.0.2\res" -S "C:\Users\mreso\Documents\Falling Delivery\Temp\StagingArea\android-libraries\play-services-base-9.0.2\res" -S "C:\Users\mreso\Documents\Falling Delivery\Temp\StagingArea\android-libraries\play-services-basement-9.0.2\res" -S "C:\Users\mreso\Documents\Falling Delivery\Temp\StagingArea\android-libraries\play-services-drive-9.0.2\res" -S "C:\Users\mreso\Documents\Falling Delivery\Temp\StagingArea\android-libraries\play-services-games-9.0.2\res" -S "C:\Users\mreso\Documents\Falling Delivery\Temp\StagingArea\android-libraries\play-services-nearby-9.0.2\res" -S "C:\Users\mreso\Documents\Falling Delivery\Temp\StagingArea\android-libraries\play-services-tasks-9.0.2\res" -S "C:\Users\mreso\Documents\Falling Delivery\Temp\StagingArea\android-libraries\support-v4-23.0.0\res" -S "C:\Users\mreso\Documents\Falling Delivery\Temp\StagingArea\android-libraries\unityads\res"

stderr[

] stdout[ .....