Failed to re-package resources. Unity 5

I tried to build my application for android and compilation stopprd with the error:
CommandInvokationFailure: Failed to re-package resources. See the Console for details.
C:\Users\Admin\AppData\Local\Android\android-sdk\build-tools\22.0.1\aapt.exe package --auto-add-overlay -v -f -m -J gen -M AndroidManifest.xml -S “res” -I “C:/Users/Admin/AppData/Local/Android/android-sdk/platforms/android-19\android.jar” -F bin/resources.ap_

stderr[
AndroidManifest.xml:4: error: No resource identifier found for attribute ‘isGame’ in package ‘android’

AndroidManifest.xml:4: error: No resource identifier found for attribute ‘banner’ in package ‘android’

]
stdout[
Configurations:
(default)
xhdpi-v4

Files:
drawable\app_banner.png
Src: (xhdpi-v4) res\drawable-xhdpi\app_banner.png
drawable\app_icon.png
Src: () res\drawable\app_icon.png
values\strings.xml
Src: () res\values\strings.xml
AndroidManifest.xml
Src: () AndroidManifest.xml

Resource Dirs:
Type drawable
drawable\app_banner.png
Src: (xhdpi-v4) res\drawable-xhdpi\app_banner.png
drawable\app_icon.png
Src: () res\drawable\app_icon.png
Type values
values\strings.xml
Src: () res\values\strings.xml
Including resources from package: C:\Users\Admin\AppData\Local\Android\android-sdk\platforms\android-19\android.jar
applyFileOverlay for drawable
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-xhdpi\app_banner.png
Processing image: res\drawable\app_icon.png
(processed image res\drawable\app_icon.png: 94% size of source)
(processed image res\drawable-xhdpi\app_banner.png: 93% size of source)
(new resource id app_banner from xhdpi-v4\drawable\app_banner.png #generated)
(new resource id app_icon from drawable\app_icon.png #generated)
]
UnityEditor.Android.Command.Run (System.Diagnostics.ProcessStartInfo psi, UnityEditor.Android.WaitingForProcessToExit waitingForProcessToExit, System.String errorMsg)
UnityEditor.Android.PostProcessAndroidPlayer.Exec (System.String command, System.String args, System.String workingdir, System.String progress_strings, Single progress_value, System.String errorMsg)
UnityEditor.Android.PostProcessAndroidPlayer.CompileResources (System.String stagingArea, System.String packageName, UnityEditor.Android.AndroidLibraries androidLibraries)
UnityEditor.Android.PostProcessAndroidPlayer.PostProcessInternal (BuildTarget target, System.String stagingAreaData, System.String stagingArea, System.String playerPackage, System.String installPath, System.String companyName, System.String productName, BuildOptions options)
UnityEditor.Android.PostProcessAndroidPlayer.PostProcess (BuildTarget target, System.String stagingAreaData, System.String stagingArea, System.String playerPackage, System.String installPath, System.String companyName, System.String productName, BuildOptions options)
UnityEditor.HostView:OnGUI()

You seem to be missing Android SDK level 21. But we should detect this situation and ask for SDK update.

Can you please submit a bug report, post the case number here (before you update your SDK)?