Issue regarding calculation of box counting dimension of a given image of galaxy contour

[Subhadip-15]

If I try to run the code in MATLAB, this code is giving error even on its own jpeg images. I have used here the image of Vicsek Fractal
It is showing this warning if I try to run the code in MATLAB,

getfractaldim("vicsek-fractal.png", 180, 40, 10)
Current plot heldWarning: Polynomial is not unique; degree >= number of data points. > In [polyfit](matlab:matlab.internal.language.introspective.errorDocCallback('polyfit', '/MATLAB/toolbox/matlab/polyfun/polyfit.m', 79)) ([line 79](matlab: opentoline('/MATLAB/toolbox/matlab/polyfun/polyfit.m',79,0)))
In [getfractaldim](matlab:matlab.internal.language.introspective.errorDocCallback('getfractaldim', '/MATLAB Drive/fractal-dimensions/getfractaldim.m', 47)) ([line 47](matlab: opentoline('/MATLAB Drive/fractal-dimensions/getfractaldim.m',47,0)))
Fractal Dimension = 0.000000
Array indices must be positive integers or logical values.

Error in [getfractaldim](matlab:matlab.internal.language.introspective.errorDocCallback('getfractaldim', '/MATLAB Drive/fractal-dimensions/getfractaldim.m', 54)) ([line 54](matlab: opentoline('/MATLAB Drive/fractal-dimensions/getfractaldim.m',54,0)))
text(x(end),y(end)+2,"FD = " + num2str(fd));