Warning PolyCurve.ByPoints operation failed. Cannot make a PolyCurve from an empty list

Hi

I am new to dynamo and I want to use it to generate a massing model from openstreetmap. I have been getting this error but I am struggling to fix it.

The error says ‘Warning: PolyCurve.ByPoints operation failed.
Cannot make a PolyCurve from an empty list’

I have double checked the list but cannot find a nul etc. I have tried a new node but nothing.

Please help

Can’t tell anything without seeing your Points output. Try using List.IsEmpty to see if you get any True values.