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java.lang.NoClassDefFoundError: Failed resolution of: Ljava/awt/GraphicsEnvironment;	at weka.core.packageManagement.PackageManager.setProxyAuthentication(PackageManager.java:191)	at weka.core.WekaPackageManager.establishWekaHome(WekaPackageManager.java:377)	at weka.core.WekaPackageManager.(WekaPackageManager.java:162)	at weka.core.Utils.readProperties(Utils.java:174)	at weka.core.Capabilities.(Capabilities.java:275)	at weka.classifiers.AbstractClassifier.getCapabilities(AbstractClassifier.java:508)	at weka.classifiers.trees.RandomTree.getCapabilities(RandomTree.java:602)	at weka.classifiers.trees.RandomForest.getCapabilities(RandomForest.java:182)	at weka.classifiers.meta.Bagging.buildClassifier(Bagging.java:701)	at com.example.weirdmyth.testapp.MainActivity.showExtractData(MainActivity.java:68)	at com.example.weirdmyth.testapp.MainActivity.access$000(MainActivity.java:18)	at com.example.weirdmyth.testapp.MainActivity$1.onClick(MainActivity.java:35)	at android.view.View.performClick(View.java:4794)	at android.view.View$PerformClick.run(View.java:19905)	at android.os.Handler.handleCallback(Handler.java:739)	at android.os.Handler.dispatchMessage(Handler.java:95)	at android.os.Looper.loop(Looper.java:139)	at android.app.ActivityThread.main(ActivityThread.java:5298)	at java.lang.reflect.Method.invoke(Native Method)	at java.lang.reflect.Method.invoke(Method.java:372)	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:950)	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:745)