[PLS HELP] Error using horzcat CAT arguments dimensions are not consistent.with debug error image attached

i got an error mentioning about dimension not consistent while trying on the LBP operator. i'm running in a loop for 4 images. I have 2 loops in my program, I suppose to change the convector= 1800 x 1 into data = 450 x4 (4 images) but since it happen in a loop how can i do it? i need to store it into the data. the error occur on the last command , any advise will greatly appreciated

        for f=1:blockSizeR
             for g=1:blockSizeC

            blockVectorR = (f -1) * wholeBlockRows+1 ;
          blockVectorC = (g-1) * wholeBlockCols+1 ;  

              blockRR = blockVectorR + wholeBlockRows-1;
          blockCC = blockVectorC + wholeBlockCols-1;

        Ism = X(blockVectorR:blockRR , blockVectorC:blockCC);

           feature_vector = lbp(Ism,3,24,MAPPING,'hist');
        convector=[convector;feature_vector]; 

             end
        end

 data =[data ,convector];

[zara]

I have attached the error found in debug mode. please advise.