'A conclusion about impixel Func in matlab

I am new to matlap

And this is a simple impixel statement :
I = imread('user.png'); impixel(I)


the error : Error using getpts (line 174) Interruption during mouse point selection.

Error in impixel>parse_inputs (line 199) [xi,yi] = getpts(ancestor(h,'axes'));
Error in impixel (line 76) [a,cm,xi,yi,x,y] = parse_inputs(varargin{:});

Error in first (line 2) impixel(I);


The name of file is "first" What is wrong here ,i have been searching a whole day , any help please


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