openstreetmap-carto for switch2osm ''from packages"

I have an OSM tile server that I built using switch2osm "Building a tile server from packages". It works fine. Now I want to make some styling changes. I have set up openstreetmap-carto as per the instructions. When I create the xml file I get the same error as described in a previous post

I took the advice there and now get SQL errors:

ERROR:  column "pixel_width" does not exist LINE 2: ...y, "natural", waterway, landuse, name, way_area/(!pixel_widt...                                                              ^ Full sql was: 'SELECT * FROM (SELECT     way, "natural", waterway, landuse, name, way_area/(!pixel_width!*!pixel_height!) AS way_pixels   FROM planet_osm_polygon   WHERE     (waterway IN ('dock', 'riverbank', 'canal')       OR landuse IN ('reservoir','basin')       OR "natural" IN ('lake','water','land','glacier','mud'))     AND building IS NULL     AND way_area/(!pixel_width!*!pixel_height!) > 0.01   ORDER BY z_order, way_area) AS water_areas LIMIT 0'  (encountered during parsing of layer 'water-areas' in map '/etc/mapnik-carto/ma

Any help would be fantastic.

Harold Ship