[Tilecache] cannot identify image file

[Pascal Ehlert]

Hi all!

First, I'm new to this list and would like to thank all Tilecache  
developers and contributors for their work!

Okay, let's come to the actual problem..
I'm trying to use the MetaCarta "satellite" layer as a background in  
my application (I hope this is allowed).
I could include it directly into OpenLayers, but I don't want to put  
extra load on the MetaCarta server and am thus trying to use  
Tilecache as a proxy there which, once all images I need are  
downloaded, acts as the only server.

My Tilecache configuration now looks like this:

[MetaCarta_satellite]
type=WMSLayer
url=http://labs.metacarta.com/wms-c/Basic.py
layers=satellite
extension=png
metaTile=false
debug=false

This configuration works in OpenLayers, but using Tilecache I get the  
following error instead of an image:

An error occurred: cannot identify image file
   File "/usr/lib/python2.4/site-packages/TileCache/Service.py", line  
452, in wsgiHandler
     format, image = service.dispatchRequest( fields, path_info,  
req_method, host )
   File "/usr/lib/python2.4/site-packages/TileCache/Service.py", line  
405, in dispatchRequest
     return self.renderTile(tile, params.has_key('FORCE'))
   File "/usr/lib/python2.4/site-packages/TileCache/Service.py", line  
367, in renderTile
     data = layer.render(tile)
   File "/usr/lib/python2.4/site-packages/TileCache/Layer.py", line  
248, in render
     image = self.renderMetaTile(metatile, tile)
   File "/usr/lib/python2.4/site-packages/TileCache/Layer.py", line  
211, in renderMetaTile
     image = Image.open( StringIO.StringIO(data) )
   File "/usr/lib/python2.4/site-packages/PIL/Image.py", line 1745,  
in open
     raise IOError("cannot identify image file")


I hope anyone has an idea.. I couldn't find anything like this in the  
web..
Thank you in advance!

Pascal

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