Unity in-app purchasing service occurs crash on Android

I am using Unity 5.3.4 and my project contains;

• Google play services v9.33 (latest)

• Admob (latest version)

When I enable the unity in-app purchasing from services, app dies right after opening the app. From the log, you can see it falls in to "onPause" state. I didn't even used Unity in-app purchasing in any of my scripts. Probably it has a conflict with something.

Edit 1 : I am seeing that failure at the beginning of the process and after the end of the process which may be related to this problem.

Failure retrieving resources for com.xxxxx.xxxxx: Resource ID #0x0

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Thx for help.

Here is my log ;

 (Filename: /Users/xxxxx/Documents/Android Race/Assets/_GameRoot/Scripts/Class/GooglePlayServices.cs Line: 28)
 I/Unity   : ******** Play game Activated
 I/Unity : UnityEngine.DebugLogHandler:Internal_Log(LogType, String, Object)
 I/Unity  : UnityEngine.DebugLogHandler:LogFormat(LogType, Object, String, Object[])
 I/Unity  : UnityEngine.Logger:Log(LogType, Object)
 I/Unity   : UnityEngine.Debug:Log(Object)
 I/Unity   : GooglePlayServices:Start() (at /Users/xxxxx/Documents/Android Race/Assets/_GameRoot/Scripts/Class/GooglePlayServices.cs:35)
 I/Unity   :  
 I/Unity   : (Filename: /Users/xxxxx/Documents/Android Race/Assets/_GameRoot/Scripts/Class/GooglePlayServices.cs Line: 35)
 I/Unity  : 
 I/Unity   : onPause
 D/Unity  : Setting up 1 worker threads for Enlighten.
 D/Unity   :   Thread -> id: 8ee08b00 -> priority: 1 
 W/ActivityManager: getRecentTasks: caller 10085 does not hold GET_TASKS; limiting output
 W/ActivityManager: Activity pause timeout for ActivityRecord{38cc9fac u0 com.xxxxx.xxxxx/com.unity3d.player.UnityPlayerActivity t430 f}
 W/ActivityManager: getRecentTasks: caller 10085 does not hold GET_TASKS; limiting output
 W/Unity   : Timeout while trying to pause the Unity Engine.
 I/ActivityManager: Displayed com.xxxxx.xxxxx/com.unity3d.player.UnityPlayerProxyActivity: +21s934ms
 W/ActivityManager: getRecentTasks: caller 10085 does not hold GET_TASKS; limiting output
 I/Unity   (28267): windowFocusChanged: false
 D/Unity   (28267): [EGL] Attaching window :0x0
 W/ActivityManager(  737): getRecentTasks: caller 10085 does not hold GET_TASKS; limiting output
 I/ActivityManager(  737): Config changes=480 {1.0 ?mcc?mnc en_US ?layoutDir sw360dp w360dp h567dp 480dpi nrml port finger -keyb/v/h -nav/h s.104}
 V/ActivityManager(  737): Display changed displayId=0
 V/ActivityManager(  737): Display changed displayId=0
 W/ActivityManager(  737): Activity pause timeout for ActivityRecord{19e9f003 u0 com.xxxxx.xxxxx/com.unity3d.player.UnityPlayerProxyActivity t430}
 W/ActivityManager(  737): getRecentTasks: caller 10085 does not hold GET_TASKS; limiting output
 I/Unity   (28267): onDestroy
 I/ActivityManager(  737): Process com.xxxxx.xxxxx (pid 28267) has died
 W/ActivityManager(  737): Force removing ActivityRecord{19e9f003 u0 com.xxxxx.xxxxx/com.unity3d.player.UnityPlayerProxyActivity t430}: app died, no saved state
 W/PackageManager(  888): Failure retrieving resources for com.xxxxx.xxxxx: Resource ID #0x0
 W/ActivityManager(  737): Sleep timeout!  Sleeping now.