predict() returning 0

Hi, I am trying to test the results of a fitcsvm model, as shown below:

    SVM_1_2 = fitcsvm(training_space,labels);
    [label,score] = predict(SVM_1_2,space);

Where training_space is a sub_space of the total space. label is always an array full of zero, even for the points in training_space

I do not understand why predict is not giving me the predicted class of all the points in space. Can anyone help me, please?

[the cyclist]

It's pretty difficult to help here, without the data. Can you upload the data (or a small sample that shows the same problem) in a MAT file?