What does the TypeError "Expected Ptr<cv::UMat> for argument 'labels'" in OpenCV mean?

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The TypeError "Expected Ptr<cv::umat> for argument 'labels'" in OpenCV means that an argument with the name 'labels' is expected to be a pointer to a cv::UMat data type, but it is of a different or incompatible data type. This error usually occurs when working with OpenCV functions that require the labels argument to be a pointer to cv::UMat, such as in image segmentation tasks.