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This exception has no message.
java.lang.ExceptionInInitializerError at org.apache.cordova.CordovaActivity.makeWebView(CordovaActivity.java:340) at org.apache.cordova.CordovaActivity.init(CordovaActivity.java:376) at org.apache.cordova.CordovaActivity.init(CordovaActivity.java:368) at com.example.hello1.hello1.onCreate(hello1.java:31) 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.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.Class org.xwalk.core.XWalkCoreWrapper.getBridgeClass(java.lang.String)' on a null object reference at org.xwalk.core.XWalkPreferences.setValue(XWalkPreferences.java:106) at org.apache.cordova.CordovaWebView.<clinit>(CordovaWebView.java:897) ... 16 more