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java.lang.NullPointerException: 	at org.webrtc.PeerConnectionFactory.createVideoSource(PeerConnectionFactory.java:111)	at kr.co.iosystem.blackeyeonandroid.BlackEyeActivity.onCreate(BlackEyeActivity.java:226)	at android.app.Activity.performCreate(Activity.java:5231)	at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)	at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2148)	at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2233)	at android.app.ActivityThread.access$800(ActivityThread.java:135)	at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)	at android.os.Handler.dispatchMessage(Handler.java:102)	at android.os.Looper.loop(Looper.java:136)	at android.app.ActivityThread.main(ActivityThread.java:5001)	at java.lang.reflect.Method.invokeNative(Native Method)	at java.lang.reflect.Method.invoke(Method.java:515)	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)	at dalvik.system.NativeStart.main(Native Method)