How to make predictions using an exported classification model in matlab?

I used the Matlab classification leaner app. The model has three predictors (numeric) and the response is categorical (Hign or Low). I exported the trained model to a workspace variable named "tranedModel". Then I wrote this in the comment window to make new predictions :

T=[2.5 3.6 1.7]; % T is the new data with three predictors;
yfit = trainedModel.predictFcn(T);

But it keeps giving the error. Thanks a lot.

[KSSV]

What error? With out telling error, how you think you will get help?