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(
at org.opencv.imgproc.Imgproc.findContours(
at fyp.hkust.facet.activity.ColorizeFaceActivity.detectRegion(
at fyp.hkust.facet.activity.ColorizeFaceActivity.access$1600(
at fyp.hkust.facet.activity.ColorizeFaceActivity$5.onClick(
at android.view.View.performClick(
at android.view.View$
at android.os.Handler.handleCallback(
at android.os.Handler.dispatchMessage(
at android.os.Looper.loop(

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