Share 'creating a coloured mesh'

Hi all,   I'm trying to develop a custom component which adds a colour gradient to a mesh created from a Brep (inputBrep), however I can't get the hang of working with the MeshVertexColorList collection. The (summarised) code below (just adding the colour red to all vertices in this example) leaves me with an error unfortunately.   Could someone give an explanation on 1) how to work with the Mesh…