xxxk@xxx:~$ tilestache-server -c tilestache.cfg -i 51.254.127.82 -p 8080
/usr/lib/python2.7/dist-packages/mapnik2/__init__.py:27: DeprecationWarning:  mapnik2 module has been deprecated,
        please use 'import mapnik'
  warnings.warn(msg, DeprecationWarning)
Traceback (most recent call last):
  File "/usr/bin/tilestache-server", line 55, in <module>
    app = TileStache.WSGITileServer(config=options.file, autoreload=True)
  File "/usr/lib/python2.7/dist-packages/TileStache/__init__.py", line 375, in __init__
    raise Core.KnownUnknown("Error loading Tilestache config file:\n%s" % str(e))
TileStache.Core.KnownUnknown: Error loading Tilestache config file:
Unknown provider name: "mapnik grid"