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java.lang.NoClassDefFoundError: com.itextpdf.text.Document	at com.example.pdfandroid.MainActivity.createPDF(MainActivity.java:36)	at java.lang.reflect.Method.invokeNative(Native Method)	at java.lang.reflect.Method.invoke(Method.java:515)	at android.view.View$1.onClick(View.java:3964)	at android.view.View.performClick(View.java:4640)	at android.view.View$PerformClick.run(View.java:19431)	at android.os.Handler.handleCallback(Handler.java:733)	at android.os.Handler.dispatchMessage(Handler.java:95)	at android.os.Looper.loop(Looper.java:146)	at android.app.ActivityThread.main(ActivityThread.java:5598)	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:1283)	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1099)	at dalvik.system.NativeStart.main(Native Method)