Session Class

In trying to reduce database calls, I've created a class (we'll call it
MyClass) which is created in the login page. I'm trying to store it in a
session variable, and when I call the code:

Class Security
...
End Class

SET objSecurty = new Security
....
Session("Security") = objSecurity

On the session() = line, I get the error:

Session object error 'ASP 0185 : 80020003'
Missing Default Property
/login.asp, line 123
A default property was not found for the object.

Anyone got any ideas?