Why this multithresh function doesn´t work for my image?

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Veronika
Veronika 2017-2-22
Dear all,
I have this image
and I would like to use multithresh function for this. But this error appeared:
Undefined function 'multithresh' for input arguments of type 'uint8'.
Error in Otsu_databaze (line 22)
level = multithresh(I);
This is my code:
clc;close all;clear all;
I = imread('CT_sken_zkusebni2.jpg');
imshow(I)
I = I(:, :, 2);
level = multithresh(I);
seg_I = imquantize(I,level);
figure
imshow(seg_I,[])
I also attach my image.
Thank you for your answers.

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