We have some time back upgraded a solution from DW8 to a DW 9.4.9.
The solution have a custom module, which uses a removed namespace: Dynamicweb.Backend
<%@ Import Namespace="Dynamicweb.Backend" %>
It's in the aspx file.
I have tried to search the doc site for information on upgrading a module. The module works in the frontend, but I get an error on the namespace, when I want to edit it in the backend.
Are there some workaround to this error or do we have to rewrite the entire module?