Problem with thallus design code

I have attached a screenshot of error , I can’t understand where it is going wrong, kindly help

Hi @yashizking

I can’t tell just from the screenshot - I’d need the file to say for sure.
Anyway, it seems you are trying to do something like this, so the discussion here might help:

thallus fail.3dm (4.0 MB) thallus (11.4 KB)
hey thanks! this is the file. I do not understand the kangaroo in detail and still learning by myself.