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java.lang.NoClassDefFoundError: org.achartengine.model.CategorySeries	at com.spintum.preexam.Fragment_Statistics.onCreateView(Fragment_Statistics.java:30)	at android.app.Fragment.performCreateView(Fragment.java:1700)	at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:890)	at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1062)	at android.app.BackStackRecord.run(BackStackRecord.java:698)	at android.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1447)	at android.app.Activity.performStart(Activity.java:5273)	at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2311)	at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2390)	at android.app.ActivityThread.access$800(ActivityThread.java:151)	at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1321)	at android.os.Handler.dispatchMessage(Handler.java:110)	at android.os.Looper.loop(Looper.java:193)	at android.app.ActivityThread.main(ActivityThread.java:5292)	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:824)	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:640)	at dalvik.system.NativeStart.main(Native Method)