Please help me, fix the dynamo I created, if in Revit version 2021 I managed to use the group parameter.
check out the input types, pin 1 expects single string (string array is given) and pin 3 expects single string (GroupType is given)
Hi @cucu.s.rukmana and welcome…that looks like a custom nodes where is that from ? in 21 if i remember we used PG_grouptypes, in newer builds is it spec.grouptypes…but not sure if it could be the issue
I don’t know if this is any help but i use the node from Orchid in Revit 2024.
Not sure if Orchid was already available for Revit 2021.
In 24 and 25 i use this one here from @c.poupin Create new family parameter - #13 by c.poupin and work like a charm, thanks Cyril 
i have just modified it a bit with a input document so it can work in BG open as well…
1 Like
This is way i like to post what I use. If others do to i know what is out there (alternatives)
and what is working or not working.
1 Like
yeah 100…crumple have some nodes for that as well, havent tried, but hear from others it work as well
Share me please dyn data 
thats what i already have done, use the link to Cyrils post and there you have some solutions…