Problem with external-graphic: Unsupported color conversion reque st

I use this code to embed a graphic file in my RTF:
<fo:block>
<fo:external-graphic height="40pt"
src="D:\jakarta-tomcat-4.0.1\webapps\cocoon\mount\AigleK\images\ecusson.jpg"
/> 
</fo:block>

The file is displayed, but it's all black. I found that the sample graphics
aren't working either, so maybe this is  linked?
Here's the error I get:


sun.awt.image.ImageFormatException: Unsupported color conversion request
        at sun.awt.image.JPEGImageDecoder.readImage(Native Method)
        at
sun.awt.image.JPEGImageDecoder.produceImage(JPEGImageDecoder.java:132
)
        at
sun.awt.image.InputStreamImageSource.doFetch(InputStreamImageSource.j
ava:257)
        at sun.awt.image.ImageFetcher.fetchloop(ImageFetcher.java:217)
        at sun.awt.image.ImageFetcher.run(ImageFetcher.java:185)
sun.awt.image.ImageFormatException: Unsupported color conversion request
        at sun.awt.image.JPEGImageDecoder.readImage(Native Method)
        at
sun.awt.image.JPEGImageDecoder.produceImage(JPEGImageDecoder.java:132
)
        at
sun.awt.image.InputStreamImageSource.doFetch(InputStreamImageSource.j
ava:257)
        at sun.awt.image.ImageFetcher.fetchloop(ImageFetcher.java:217)
        at sun.awt.image.ImageFetcher.run(ImageFetcher.java:185)
sun.awt.image.ImageFormatException: Unsupported color conversion request
        at sun.awt.image.JPEGImageDecoder.readImage(Native Method)
        at
sun.awt.image.JPEGImageDecoder.produceImage(JPEGImageDecoder.java:132
)
        at
sun.awt.image.InputStreamImageSource.doFetch(InputStreamImageSource.j
ava:257)
        at sun.awt.image.ImageFetcher.fetchloop(ImageFetcher.java:217)
        at sun.awt.image.ImageFetcher.run(ImageFetcher.java:185)
sun.awt.image.ImageFormatException: Unsupported color conversion request
        at sun.awt.image.JPEGImageDecoder.readImage(Native Method)
        at
sun.awt.image.JPEGImageDecoder.produceImage(JPEGImageDecoder.java:132
)
        at
sun.awt.image.InputStreamImageSource.doFetch(InputStreamImageSource.j
ava:257)
        at sun.awt.image.ImageFetcher.fetchloop(ImageFetcher.java:217)
        at sun.awt.image.ImageFetcher.run(ImageFetcher.java:185)


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