Hi Kyle. I followed Vikram instructions and it fixed the first two errors connected to the Width and Length [Image 1]. However, when I changed the Python Script with the LunchBox Mass Addition, I got null values within the LunchBox.Mass Addition which generated errors in the List.AddItemToFront and in the second Code Block bouncing back to the Width and Length nodes as you can see in the image below [Image 2]. Then, the other errors in the Math.Sum and in the Point.ByCoordinates are still there. The first null values appear the in the List.Transpose before List.Map and Math.Sum [Image 3 and Image 4]. I have added a Python Script between the Math.Sum and the List.Map nodes and the Point.ByCoordinates node has fixed itself. I don’t actually know why but it did. [Image 5] However, I lost two elements from my list and the results were all 0,0,0. If I leave Python Script there, then I get the null values in the List.Combine [Image 6]. If I remove the Python Script, then the resut is see in Image 7. Is there anything else that I can do to fix the errors? I thank you beforehand for your help and attention Kyle.