Hii,
You can verify the path where respective images, label files are stored and include those paths correctly in the code. The easiest way to access images, label files is to add them to current working folder.
Below is sample code which I have tried ,where images is the folder containing .jpg files placed in the current working folder(matlab path)
imds = imageDatastore('images')
classNames = ["sky" "grass" "blue"];
labelIDs = [1 2 3];
pxds = pixelLabelDatastore('images',classNames,labelIDs);
pximds = pixelLabelImageDatastore(imds,pxds);
Please refer to the below link for more details:
