java.lang.IllegalArgumentException: Output List can't be null

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java.lang.IllegalArgumentException: Output List can't be null
at org.opencv.utils.Converters.Mat_to_vector_vector_Point(Converters.java:494)
at org.opencv.imgproc.Imgproc.findContours(Imgproc.java:2112)
at fyp.hkust.facet.activity.ColorizeFaceActivity.detectRegion(ColorizeFaceActivity.java:325)
at fyp.hkust.facet.activity.ColorizeFaceActivity.access$1600(ColorizeFaceActivity.java:74)
at fyp.hkust.facet.activity.ColorizeFaceActivity$5.onClick(ColorizeFaceActivity.java:304)
at android.view.View.performClick(View.java:5280)
at android.view.View$PerformClick.run(View.java:21239)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:234)
at android.app.ActivityThread.main(ActivityThread.java:5526)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)

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