[OpenLayers-Users] TileCache w/ Mapserver WMS question

[Matthew Perry]

Hey folks,

I've got a question about a TileCache setup.

I've got a working WMS:
http://ebm.nceas.ucsb.edu/cgi-bin/mapserv?map=/maps/threats.map&layers=nedrape&SERVICE=WMS&VERSION=1.1.1&REQUEST=GetMap&STYLES=&EXCEPTIONS=application/vnd.ogc.se_inimage&FORMAT=image/jpeg&SRS=EPSG:4326&BBOX=-45,0,0,45&WIDTH=256&HEIGHT=256

I'm trying to point my tilecache.cfg at it:
[base]
type=WMSLayer
url=http://ebm.nceas.ucsb.edu/cgi-bin/mapserv?map=/maps/threats.map&
layers=nedrape
extension=png

Trying to request it via a tilecache:
http://ebm.nceas.ucsb.edu/tilecache/tilecache.py?LAYERS=base&SERVICE=WMS&VERSION=1.1.1&REQUEST=GetMap&STYLES=&EXCEPTIONS=application/vnd.ogc.se_inimage&FORMAT=image/jpeg&SRS=EPSG:4326&BBOX=-45,0,0,45&WIDTH=256&HEIGHT=256

... gives me the following error:
An error occurred: Zero length data returned from layer.
  File "/mnt/raid/services/tilecache/TileCache/Service.py", line 397,
in modPythonHandler
    host )

  File "/mnt/raid/services/tilecache/TileCache/Service.py", line 382,
in dispatchRequest
    return self.renderTile(tile, params.has_key('FORCE'))

  File "/mnt/raid/services/tilecache/TileCache/Service.py", line 361,
in renderTile
    else: raise Exception("Zero length data returned from layer.")

Any ideas?
-- 
Matthew T. Perry
GIS Analyst / Software Engineer
National Center for Ecological Analysis and Synthesis (NCEAS)
work: perry at nceas.ucsb.edu
web: http://www.perrygeo.net