The error can be reproduced by running the following script (I ran it in the Script Editor): ```python #@ OpService ops #@ Img inputData #@OUTPUT net.imglib2.roi.labeling.ImgLabeling labeling from net.imglib2.algorithm.labeling.ConnectedComponents import StructuringElement from net.imglib2.roi.labeling import ImgLabeling; # otsu threshold and display thresholded = ops.threshold().otsu(inputData) # call connected components to label each connected region labeling = ops.labeling().cca(thresholded, StructuringElement.FOUR_CONNECTED) ```