TileIndex & Raster Images Problem

[C Gould]

Folks,
I have several layers using TileIndexes which link to georeferenced tif
images. The layers show happily (when in zoom range) when one of the
images is displayed on the map image being requested but mapserver fails
with the following error message if there is no tile being displayed on
the reqeusted map image:

msDrawMap(): Image handling error. Failed to draw layer named 'Blah'

I'm probably doing something quite stupid, but can anyone suggest what?
Ta
C

Craig Gould 

__________________________________________
British Telecommunications plc
Registered office: 81 Newgate Street London EC1A 7AJ
Registered in England no. 1800000 
This electronic message contains information from British
Telecommunications plc which may be privileged and confidential. The
information is intended to be for the use of the individual(s) or entity
named above. If you are not the intended recipient, be aware that any
disclosure, copying, distribution or use of the contents of this
information is prohibited. If you have received this electronic message
in error, please notify us by telephone or email (to the number or
address above) immediately. 
Activity and use of the British Telecommunications plc email system is
monitored to secure its effective operation and for other lawful
business purposes. Communications using this system will also be
monitored and may be recorded to secure effective operation and for
other lawful business purposes


-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.osgeo.org/pipermail/mapserver-users/attachments/20040805/248998c5/attachment.html