I can not build the game with ADMOB and UNITYADS

Error building Player: CommandInvokationFailure: Failed to re-package resources. See the Console for details.
E:\sdk\adt-bundle-windows-x86_64-20140702\sdk\build-tools\21.1.1\aapt.exe package --auto-add-overlay -v -f -m -J gen -M AndroidManifest.xml -S "res" -I "E:/sdk/adt-bundle-windows-x86_64-20140702/sdk/platforms/android-21\android.jar" -F bin/resources.ap_ --extra-packages com.google.unity:com.unity3d.ads.android -S "D:\RacerKing\RacerKing\Temp\StagingArea\android-libraries\unityads\res"

stderr[
AndroidManifest.xml:17: error: Error: No resource found that matches the given name (at 'value' with value '@Integer/google_play_services_version').

]
stdout[
Configurations:
(default)

Files:
values\strings.xml
Src: () D:\RacerKing\RacerKing\Temp\StagingArea\android-libraries\unityads\res\values\strings.xml
AndroidManifest.xml
Src: () AndroidManifest.xml

Resource Dirs:
Type drawable
Type layout
Type values
values\strings.xml
Src: () D:\RacerKing\RacerKing\Temp\StagingArea\android-libraries\unityads\res\values\strings.xml
Including resources from package: E:\sdk\adt-bundle-windows-x86_64-20140702\sdk\platforms\android-21\android.jar
applyFileOverlay for drawable
trying overlaySet Key=app_icon.png
applyFileOverlay for layout
applyFileOverlay for anim
applyFileOverlay for animator
applyFileOverlay for interpolator
applyFileOverlay for transition
applyFileOverlay for xml
applyFileOverlay for raw
applyFileOverlay for color
applyFileOverlay for menu
applyFileOverlay for mipmap
Processing image: res\drawable\app_icon.png
(processed image res\drawable\app_icon.png: 94% size of source)
(new resource id app_icon from drawable\app_icon.png #generated)
]