Installation of Revit AddIn for RFEM 6

Practical Applications Using Python and RFEM 6 | 2D Truss Generator
This article looks at a practical use case of programming a 2D Truss Generator GUI with Python.
- After starting a web service or an interface from RFEM 6 / RSTAB 9, I get an error message. What can I do?
- How can I enable model add-ons when using WebService? How can I create a new model with add-ons enabled?
- I have a 3D model and try to split it up into "walls" and "surfaces" with the Building Model and to calculate them separately. However, my structural system becomes unstable then. What can be the reason?