neural network toolbox classify(net, x) function not working

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matlab classify(net,x) generating undefined

overtime i run classify(net,x) on a trained neural network i get this output

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my neural network is convolutional neural network that is trying to classify cancer images. Im using nfold cross validation andntrying to measure accuracy of each fold. For my second fold works fine but my first fold is generating this weird output. Im training my network 5 time for 5-fold cross validation and getting accuracy average over those 5

here is my code :

convnet11Fold1  = trainNetwork(Train1,layers,options)
save convnet11Fold1
YPred1 = predict(convnet11Fold1,nfoldTest1)
YTest1 = classify(convnet11Fold1,nfoldTest1)
TTest1 = nfoldTest1.Labels
accuracy1 = sum(YTest1 == TTest1)/numel(TTest1)
accuracyTotal(end+1)= accuracy1
totalT(end+1)= numel(TTest1)
totalY(end+1)= numel(YTest1)
convnet11Fold2  = trainNetwork(Train2,layers,options)
save convnet11Fold2
YTest2 = classify(convnet11Fold2,nfoldTest2)
TTest2 = nfoldTest2.Labels
accuracy2 = sum(YTest2 == TTest2)/numel(TTest2)
accuracyTotal(end+1)= accuracy2
totalT(end+1)= numel(TTest2)
totalY(end+1)= numel(YTest2)