Error I cannot see

[gbourgetel]

Here I have some error I cannot figure out:
Class User.MyClass Extends %Library.Persistent [ ClassType = persistent ]
{
        Property MyNo As %Library.Integer [ Collection = list ];
        Method GetMyNo() As %Integer
        {
                new MyNoOut
                set MyNoOut=MyNo.GetNext("")
                quit MyNoOut
        }
}
It gives me an <UNDEFINED> error on the line set 
MyNoOut=MyNo.GetNext("") where it runs in VB. I do something wrong, but 
where.

Thank you
Gabriel