fitcsvm error for SVM Model

Hi, I am trying to train my SVM model i am getting below error

Error in fitcsvm (line 278) obj = ClassificationSVM.fit(X,Y,varargin{:});

Error in ali3 (line 8) SVMMod = fitcsvm(Data1, ClassName);

[Walter Roberson]

What is the error message? Something about no such structure or class? Index out of range?