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Seems the error message may be reported for files that are correctly encoded in UTF-8. See user report at: http://lists.w3.org/Archives/Public/public-mobile-dev/2010Sep/0000.html ... for page: http://honte.eu/ Possible leads to find the bug: - content is SVG served as image/svg+xml. Could the Checker simply end up with empty content internally and think empty content is not properly encoded as UTF-8? - content is compressed. Could the Checker run the UTF-8 encoding check on compressed content?
The second option is the right one: the mobileOK Checker does not support compression and tries to parse the body received directly as HTML. See Bug 10952 for more details.