Solar Envelopes Analysis Error

Hi everyone,

I’ve been exploring Grasshopper and recently encountered an issue while attempting a solar envelopes analysis, following a step-by-step guide. I’m getting an error message regarding a ‘None Type’ issue in the Solar Envelope panel.
After receiving some advice, I attempted to use the Curve to Polyline command to ensure all curves were properly converted. However I’m uncertain whether I applied this command correctly. I’ve attached a screenshot for reference. I’m wondering if the ‘None Type’ error persists due to my handling of the Curve to Polyline command, or if there might be another underlying issue causing this problem. Any insights or suggestions you could provide would be immensely helpful.
Thank you for your time and support