Error in excuting the unroll-component (Opennest)

I am an absolute beginner in Rhino, Grasshopper and Opennest. But I managed to build a little pavillion. Now I want to use the PlugIn to break it down into his individual parts. At the end I want to have the number of bars, their size and how much their bent.
But I always get the error-message: 1. Solution exception: Der Objektverweis wurde nicht auf eine Objektinstanz festgelegt.
and I don’t know how to correct it.

Thanks for any help!

Lil (29.0 KB)
Endversion-Pavillion.3dm (19.9 MB)

Make surfaces developable:

Thank you! That worked perfectly!!
Can you also show me, how to label the bars in the pavilion so that you can relate them directly to the individual parts. I’ve included a picture to make clear, what I’m talking about.

Many, many thanks again!

I am not following what is your question. From screenshot seems correct.

Oh sorry!
The picture is just an example from the internet. I want the same labeling for my pavillion, but I don’t know, how to do it.

This should work:

I tried your solution for the labels today, but I don’t get it in combination with the first step (the line up of the individual parts), you showed me.
Maybe you can help me again?

Endversion-Pavillion.3dm (20.0 MB) (29.3 KB)