Errors Using Pic2Points

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Hi, there! I am trying to overlay coordinate points on my groundwater site map, and I keep getting errors when trying the demo package from https://www.mathworks.com/matlabcentral/fileexchange/54799-convert-image-pixels-to-xy-coordinates. After downloading the demo files and running, this is what I get –

Im = imread('./Images/Plot.png');

CoordinateMatrix = pic2points(Im);

scatter(CoordinateMatrix (:,1), CoordinateMatrix (:,2),'.');

Error using imread>get_full_filename

File "./Images/Plot.png" does not exist.

I tried importing the Plot.png file into MATLAB and updating to that file path, but then it told me –

>> Im = imread('/Users/ivy/Documents/MATLAB/Plot.png');

CoordinateMatrix = pic2points(Im);

scatter(CoordinateMatrix (:,1), CoordinateMatrix (:,2),'.');

Unrecognized function or variable 'pic2points'.

Thanks so much in advance!