[Zope] Import problem

[Andreas Tille]

Hello,

I tried to create my first class following a tutorial.  I exported
the rudimentary class via export function.  Now I wanted to import
it on my laptop to continue working on it but importing failed with
the message:

   The object <my_class_name> does not support this operation

What could be wrong here?
Which information do you possibly need?
Is there a document to read first before trying such stuff?

Kind regards and sorry for this simple question

          Andreas.