./generate_xml.py osm.xml myosm.xml --dbname gis --host localhost --password gis --port 5432 --user gis --accept-none
Traceback (most recent call last):
  File "./generate_xml.py", line 201, in <module>
    serialize(template_xml,options)
  File "./generate_xml.py", line 77, in serialize
    mapnik.load_map(m,xml,True)
RuntimeError: PSQL error:
ERROR:  relation "planet_osm_polygon" does not exist
LINE 4:        from planet_osm_polygon
                    ^
Full sql was: 'select * from
      (select way,aeroway,amenity,landuse,leisure,man_made,military,"natural",power,tourism,name,highway,
       case when religion in ('christian','jewish') then religion else 'INT-generic'::text end as religion
       from planet_osm_polygon
       where landuse is not null
          or leisure is not null
          or aeroway in ('apron','aerodrome')
          or amenity in ('parking','university','college','school','hospital','kindergarten','grave_yard')
          or military in ('barracks','danger_area')
          or "natural" in ('field','beach','desert','heath','mud','wood','sand','scrub')
          or power in ('station','sub_station','generator')
          or tourism in ('attraction','camp_site','caravan_site','picnic_site','zoo')
          or highway in ('services','rest_area')
       order by z_order,way_area desc
      ) as leisure
       limit 0'
 (encountered during parsing of layer 'landcover')