These are not really Sigil questions, but regardless ... they're pretty hard to answer without seeing the code from those sections affected.
The first one (which is the only error) appears to be a syntax error of some kind in the css included in 'cover.xhtml'.
The other is just a warning about spaces in your image's file name. The warning doesn't appear to be fatal, but I'd probably follow the advice and rename the image without spaces.
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