[Zope] Import problem

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.