[Tilecache] Tilecache with OL + Sublayers (sublayers) = Bad transparency mask

[Paul james]

Hello all!

I have a Mapserver WMS + Openlayers application, using Geoext sublayers:
- LAYER1
   - SUBLAYER11
   - SUBLAYER12
-LAYER2
   SUBLAYER21
...


But when I try to turn on two or more layer´s sublayers, i got the error:

An error occurred: Could not combine images: Is it possible that some layers
are not 8-bit transparent images?

(Error was: bad transparency mask) File "C:\inetpub\wwwroot\Openlayer\
TileCache\Service.py", line 323, in cgiHandler format, image =
service.dispatchRequest( params, path_info, req_method, host ) File
"C:\inetpub\wwwroot\Openlayer\TileCache\Service.py", line 234, in
dispatchRequest raise Exception("Could not combine images: Is it possible
that some layers are not \n8-bit transparent images? \n(Error was: %s)" % E)


Cache miss: -180.0,-90.0,0.0,90.0, Tile: x: 0, y: 0, z: 0, time:
0.828000068665 Cache miss: -180.0,-90.0,0.0,90.0, Tile: x: 0, y: 0, z: 0,
time: 0.135999917984


Any idea?

Thanks
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