Create Custom visuals - Set bar color

Hi,

I am creating a custom Bar chart. I want to change the bar color from the color palette. Each bar should have a different color based on selection.

let colors = createColorPalette(host.colors).reset()

But I am getting the error --> "Property 'colors' does not exist on type 'IVisualHost'"

and also

selector: barDataPoint.selectionId.getSelection()

I am getting the error --> " Property 'getSelection' does not exist on type 'ISelectionId'"