how to fix error "X and Y must have the same number of elements." while calculating correlation coefficent of training dataset?

 while calculating correlation coefficient of training dataset using these command lines 

[net, info] = train(net, p',data')  % p  input and data target / the info will contain the masks

input_train = p(info.trainMask{:}==1)
target_train =  data(info.trainMask{:}==1)

net=feedforwardnet(10);
net = configure(net,input_train,target_train)
y=net(input_train)  
Rt=corrcoef(y, target_train)

facing error like "X and Y must have the same number of elements." kindly let me know how to get out of it?

[madhan ravi]

size(train) and size(target_train) what do you get? Can you post the result here?