After a steel verification , you get the error
Possible cause 1
The design of custum cross-sections (also called combined sections or Section Utility profile) is only supported for Eurocode 3. If you select a different standard in combination with custom cross-section, you’ll get the error above.
The standard for steel design can be changed using the menu Analysis > Steel Design Code.
Possible cause 2
- Make sure a steel/timber standard is selected with ‘Anaysis’ -> ‘Steel standard’ and ‘Anaysis’ -> ‘Timber standard’