How can I load Vlfeat library in MATLAB

I am currently doing a work in cell nuclei segmentation. I downloaded the Vlfeat library and as it is required, I have also tried running it in startup.m file. But I am not able to proceed further since I am encountered with the following error.

_ _Step - 1 Raw Clumps boundaries by Convex Hull & Level Set refinement... Attempt to execute SCRIPT vl_quickshift as a function: C:\Users\User\Desktop\miccai2013-master\vlfeat\toolbox\quickshift\vl_quickshift.m

Error in vl_quickseg (line 44) [map,gaps,E] = vl_quickshift(Ix, kernelsize, maxdist) ;

Error in Preprocessing_multiLS (line 21) [imSegbySP,SPLabels] = vl_quickseg(img_denoised,0.5,2,10);__