Conversion to cell from char is not possible.??

Hello guys, this is my code:

inp = input('Enter file  :');

v = VideoReader(inp);

myVideo = VideoWriter('TESTVID.mp4');
myVide.Quality = 50;
muVideo.FrameRate = 15;
k=0;

outclass = [];

outclass1 = [];
for i=1:1:200
    str=int2str(i);
    i;
    videoFrame = read(v,i);
    I = videoFrame;
    
    I = imresize(I,[224 224]);
    
    %[bboxes,scores,label] = detect(detector,I);
    all = [];
    lab = [];
    kk=0;
    
    if isempty(bboxes)
        bboxes = [1 1 1 1];
        lab = ['none'];
    end
    
    for ii=1: size(bboxes,1)
        kk=kk+1;
         cr = imcrop(I,bboxes(ii,:));
         cr = imresize(cr,[224 224]);
         out = classify(convnet,cr);
         if out=='VEHICULE ENDOMMAGER';
             aaaa='VEHICULE ENDOMMAGER';
             predict=1
          
             lab=[lab ; (aaaa)];
         elseif out=='VEHICULE NONENDOMMAGER';
              aaaa='VEHICULE NON ENDOMMAGER';
          predict=2
              
          lab=[lab ; (aaaa)];
         else
              lab=[lab ; 'none'];
              predict=3
         end
         outclass=[outclass ; predict ];
         outclass1=[outclass1 , lab ];
    end
    label_str = cell(size(lab,1),1);
    conf_val = lab;
    for iii=1:size(lab,1)
        label_str(iii) = conf_val(iii);
    end
end

And i'm getting this error what should I do please:

Conversion to cell from char is not possible.

Error in NOUVEAU (line 166)

label_str(iii) = conf_val(iii);

Answer 1

[Walter Roberson]

label_str{iii} = conf_val(iii);

[Hind Haboubi]

Thank you