Cant mesh a collection of into pipes

i have a certain number of curves and geometry(used variable pipe for achieving geometry) but now when i try to mesh it …it is not working giving error-1. Solution exception:Object reference not set to an instance of an object. …i have tried cocoon , yellow chromodoris
can someone please help ?!

Use Dendro

thank you ! did work faster , but some still show the same error nor i can upload my script in the forum