Fractal in matlab and image segmentation

Here is segmentation process and at the last i wanna count the fractal dimension of the last figure. But it goes error. Can somebody help me to fix this. Thanks

image_folder = 'C:\Users\ADMIN\Matlab\Implementasi\Week7-1\output';

outfolder = 'C:\Users\ADMIN\Matlab\Implementasi\Week7-1\segmentasi';

if ~isdir(outfolder); mkdir(outfolder); end

files = dir(fullfile(image_folder, '*.jpg'));

%I presume it has the variable map in it

for iFiles = 1:numel(files)

thisfilename = fullfile(files(iFiles).folder,files(iFiles).name);

[~, basename, ext] = fileparts(image_folder);

citra = imread(thisfilename);

%change to grayscale

grayimg = rgb2gray(citra);

figure, fig2=imshow(grayimg);

%change to green channel

green_channel = citra(:,:,2);

figure, fig3=imshow(green_channel);

%change to CLAHE (Contrast Limited Adaptive Histogram Equalization)

CLAHE = adapthisteq(green_channel);

figure, fig4=imshow(CLAHE);

ER = edge(CLAHE, 'canny');

EG = edge(CLAHE, 'canny');

EB = edge(CLAHE, 'canny');

anyedge = ER | EG | EB;

figure, fig5=imshow(anyedge)

size(fig5)

% fig = figure;

outfile = fullfile(outfolder, sprintf('%s-coba-%03d.jpg', basename, iFiles));

saveas(fig5, outfile);

% yang dihitung dimensinya yaitu citra hasil segmentasi

[n, r] = fboxcount(figure,'slope');

%Perhitungan dimensi

df = -diff(log(n))./diff(log(r));

%Menampilkan hasil dimensi

disp(['Df= ' num2str(mean(df(4:8)))]);

% end

end

[Keerthi Reddy]

Can you please provide the specific error message you are recieving? Also can you please provide which part of the code is causing the error?