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org/w3c/css/parser/Config.properties associates the property 'properties3' with 'org/w3c/css/properties3/CSS3Properties.properties' which is actually called org/w3c/css/properties3/Css3Properties.properties. Either the config file should be fixed or the file renamed, otherwise the file will not be found from case-sensitive file systems or zip/jar/etc. packages. See http://www.w3.org/mid/3f0f3c0b.197371475@smtp.bjoern.hoehrmann.de
Changed properties3 in Config.properties.