NullPointer exception Click on next

[zpluscybersecuretech]

E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.sit.a22junpdftestapplication, PID: 12173
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.sit.a22junpdftestapplication/com.sit.a22junpdftestapplication.PdfViewerActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void com.tejpratapsingh.pdfcreator.custom.ViewPagerForPhotoView.setAdapter(androidx.viewpager.widget.PagerAdapter)' on a null object reference
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2946)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3081)
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78)
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1831)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:201)
at android.app.ActivityThread.main(ActivityThread.java:6810)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:547)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:873)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void com.tejpratapsingh.pdfcreator.custom.ViewPagerForPhotoView.setAdapter(androidx.viewpager.widget.PagerAdapter)' on a null object reference
at com.tejpratapsingh.pdfcreator.activity.PDFViewerActivity.onCreate(PDFViewerActivity.java:71)
at com.sit.a22junpdftestapplication.PdfViewerActivity.onCreate(PdfViewerActivity.java:25)
at android.app.Activity.performCreate(Activity.java:7224)
at android.app.Activity.performCreate(Activity.java:7213)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1272)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2926)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3081) 
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78) 
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108) 
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1831) 
at android.os.Handler.dispatchMessage(Handler.java:106) 
at android.os.Looper.loop(Looper.java:201) 
at android.app.ActivityThread.main(ActivityThread.java:6810) 
at java.lang.reflect.Method.invoke(Native Method) 
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:547) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:873) 

[zpluscybersecuretech]

E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.sit.a22junpdftestapplication, PID: 12173
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.sit.a22junpdftestapplication/com.sit.a22junpdftestapplication.PdfViewerActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void com.tejpratapsingh.pdfcreator.custom.ViewPagerForPhotoView.setAdapter(androidx.viewpager.widget.PagerAdapter)' on a null object reference
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2946)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3081)
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78)
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1831)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:201)
at android.app.ActivityThread.main(ActivityThread.java:6810)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:547)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:873)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void com.tejpratapsingh.pdfcreator.custom.ViewPagerForPhotoView.setAdapter(androidx.viewpager.widget.PagerAdapter)' on a null object reference
at com.tejpratapsingh.pdfcreator.activity.PDFViewerActivity.onCreate(PDFViewerActivity.java:71)
at com.sit.a22junpdftestapplication.PdfViewerActivity.onCreate(PdfViewerActivity.java:25)
at android.app.Activity.performCreate(Activity.java:7224)
at android.app.Activity.performCreate(Activity.java:7213)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1272)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2926)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3081) 
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78) 
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108) 
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1831) 
at android.os.Handler.dispatchMessage(Handler.java:106) 
at android.os.Looper.loop(Looper.java:201) 
at android.app.ActivityThread.main(ActivityThread.java:6810) 
at java.lang.reflect.Method.invoke(Native Method) 
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:547) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:873)

@OverRide
protected void onNextClicked(File savedPDFFile) {
Uri pdfUri = Uri.fromFile(savedPDFFile);

Intent intentPdfViewer = new Intent(PdfCreatorActivity.this, PdfViewerActivity.class);
intentPdfViewer.putExtra(PdfViewerActivity.PDF_FILE_URI, pdfUri);

startActivity(intentPdfViewer);

}