I have added the admob Package to my project but when i try to build the apk file this error shows up please help :
![alt text][1]
CommandInvokationFailure: Unable to convert classes into dex format.
C:/Program Files/Java/jdk1.8.0_25\bin\java.exe -Xmx2048M -Dcom.android.sdkmanager.toolsdir="C:/Users/PC-Boulot/AppData/Local/Android/sdk\tools" -Dfile.encoding=UTF8 -jar "C:\PROGRAM FILES\UNITY\EDITOR\Data\PlaybackEngines\AndroidPlayer/Tools\sdktools.jar" -
stderr[
Error:Invalid command dx
]
stdout[
]
exit code: 64
UnityEditor.Android.Command.Run (System.Diagnostics.ProcessStartInfo psi, UnityEditor.Android.WaitingForProcessToExit waitingForProcessToExit, System.String errorMsg)
UnityEditor.Android.AndroidSDKTools.RunCommandInternal (System.String javaExe, System.String sdkToolsDir, System.String[] sdkToolCommand, Int32 memoryMB, System.String workingdir, UnityEditor.Android.WaitingForProcessToExit waitingForProcessToExit, System.String errorMsg)
UnityEditor.Android.AndroidSDKTools.RunCommandSafe (System.String javaExe, System.String sdkToolsDir, System.String[] sdkToolCommand, Int32 memoryMB, System.String workingdir, UnityEditor.Android.WaitingForProcessToExit waitingForProcessToExit, System.String errorMsg)
UnityEditor.BuildPlayerWindow:BuildPlayerAndRun()
[1]: /storage/temp/99017-unity.jpg
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