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That is an error thrown by the image conversion library that is being used to try and create a thumbnail from the Calibre cover (which is optional). I am guessing that it is complaining that the library code thinks that the image file is invalid in some way.
You do not mention what version/revision of Calibre2opds you are using (the most recent build being rev 272). In the current versions that message should just be logged and would not be fatal. I think in old releases the generation stops if that error occurs.
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