error using classperf in newrbf

I have a code 

data=[0.5 .3 0.6 0.5;0.2 0.3 0.5 0.9;0.1 0.7 0.2 0.8;0.5 .3 0.6 0.5;0.2 0.3 0.5 0.9;0.1 0.7 0.2 0.8]
P=data(1:3,1:2);
 T=data(1:3,3);
 a=data(4:6,1:2);
 s=data(4:6,3);
 groups=[0;1;1;0;1;1]
 groups = cellstr(num2str(groups))

     cvFolds = crossvalind('kfold', groups, 10);  %# get indices of 10-fold CV %# get indices of 10-fold CV
    cp = classperf(groups);  
    for i = 1:10   

   net = newrb(P',T',0,3,12,1);
   Y=sim(net,a')

    d=[Y' s]    

    cp = classperf(cp, d)

end

I get an error as 

Error using classperf (line 244)
When class labels of the CP object is a cell array of strings and
the classifier output is a numeric array, it must contain valid
indices of the class labels or NaNs for inconclusive results.

please help