OpenCV在Java中，为什么我不能使用Mat.CvType.CV_8UC1?

If I try to write that code Mat.CvType.CV_8UC1 I get the error CvType cannot be resolved or is not a field. What am I missing? I think I've added the correct library and DLL in the project properties because everything else seems to be working. I need to find those CV_8UC1 CV_8UC2, etc.If I try to write that code Mat.CvType.CV_8UC1