java.lang.NullPointerException

Attempt to read from field 'long org.opencv.core.Mat.nativeObj' on a null object reference

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Stack trace

  • java.lang.NullPointerException: Attempt to read from field 'long org.opencv.core.Mat.nativeObj' on a null object reference at org.opencv.imgproc.Imgproc.cvtColor(Imgproc.java:1724) at com.example.pragyan.facefeatures.ExtractFeature.trainSvm(ExtractFeature.java:242) at com.example.pragyan.facefeatures.ExtractFeature.onOptionsItemSelected(ExtractFeature.java:313) at android.app.Activity.onMenuItemSelected(Activity.java:2885) at android.support.v4.app.FragmentActivity.onMenuItemSelected(FragmentActivity.java:403) at android.support.v7.app.AppCompatActivity.onMenuItemSelected(AppCompatActivity.java:189) at android.support.v7.view.WindowCallbackWrapper.onMenuItemSelected(WindowCallbackWrapper.java:100) at android.support.v7.app.AppCompatDelegateImplV7.onMenuItemSelected(AppCompatDelegateImplV7.java:663) at android.support.v7.view.menu.MenuBuilder.dispatchMenuItemSelected(MenuBuilder.java:811) at android.support.v7.view.menu.MenuItemImpl.invoke(MenuItemImpl.java:152) at android.support.v7.view.menu.MenuBuilder.performItemAction(MenuBuilder.java:958) at android.support.v7.view.menu.MenuBuilder.performItemAction(MenuBuilder.java:948) at android.support.v7.view.menu.MenuPopupHelper.onItemClick(MenuPopupHelper.java:191) at android.widget.AdapterView.performItemClick(AdapterView.java:305) at android.widget.AbsListView.performItemClick(AbsListView.java:1146) at android.widget.AbsListView$PerformClick.run(AbsListView.java:3053) at android.widget.AbsListView$3.run(AbsListView.java:3860) at android.os.Handler.handleCallback(Handler.java:739) at android.os.Handler.dispatchMessage(Handler.java:95) at android.os.Looper.loop(Looper.java:135) at android.app.ActivityThread.main(ActivityThread.java:5254) at java.lang.reflect.Method.invoke(Native Method) at java.lang.reflect.Method.invoke(Method.java:372) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)

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