I am doing some testing with Silverlight (I know right!) and I kept getting error #2207 without really getting a detailed description. Well the issue -in MY case- was hat i was trying to download a file cross-domains, and with most plugins it was a no-no. So I just needed to change the source to local file.
JavaScript:
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Good:
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downloader.open("GET", "image-4.jpg");
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Bad
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downloader.open("GET", "http://www.helmutgranda.com/images/image-4.jpg");