Index in position 2 exceeds array bounds

How i want to solve this kind of problem ? I got an error Index in position2 exceeds array bounds

Error in RunMCSVMClassifier4 (line 20)

result = zeros(length(Xtest(:,1)),1);

function [err,M] = RunMCSVMClassifier4(Xtrain,Ytrain,Xtest,Ytest)

u=unique(Ytrain);
numClasses=length(u);
result = zeros(length(Xtest(:,1)),1);
models=[];
for k=1:numClasses
    
    G1vAll=double(Ytrain==u(k));

    models{k} = fitcsvm(Xtrain,G1vAll,'Standardize',true,....
        'KernelFunction','RBF','KernelScale','auto');
end

%classify test cases
for j=1:size(Xtest,1)
    for k=1:numClasses
        if(predict(models{k},Xtest(j,:))) 
            break;
        end
    end
    result(j) = k;
end
err=1-(sum(Ytest==result)/length(result));
if(nargout>1)
    M=confusionmat(Ytest,result);
end
end

[Jan]

Please post a complete copy of the error message, such that the readers do not have to guess, where the problem occurs.