CSS error

class org.apache.xmlbeans.XmlException
error: Unexpected character encountered: '\'
org.apache.xmlbeans.impl.store.Locale$SaxLoader.load(Locale.java:3486)
org.apache.xmlbeans.impl.store.Locale.parseToXmlObject(Locale.java:1276)
org.apache.xmlbeans.impl.store.Locale.parseToXmlObject(Locale.java:1263)
org.apache.xmlbeans.impl.schema.SchemaTypeLoaderBase.parse(SchemaTypeLoaderBase.java:345)
org.w3.x2009.x10.unicorn.observationresponse.ObservationresponseDocument$Factory.parse(Unknown
Source)
org.w3c.unicorn.response.impl.DefaultResponseXBeans.<init>(DefaultResponseXBeans.java:60)
sun.reflect.GeneratedConstructorAccessor714.newInstance(Unknown Source)
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
java.lang.reflect.Constructor.newInstance(Constructor.java:513)
class org.apache.xmlbeans.XmlException
error: Unexpected character encountered: '\'
I was trying to vadilate css on powiat.poznan.pl and there was an error:

org.apache.xmlbeans.impl.store.Locale$SaxLoader.load(Locale.java:3486)
org.apache.xmlbeans.impl.store.Locale.parseToXmlObject(Locale.java:1276)
org.apache.xmlbeans.impl.store.Locale.parseToXmlObject(Locale.java:1263)
org.apache.xmlbeans.impl.schema.SchemaTypeLoaderBase.parse(SchemaTypeLoaderBase.java:345)
org.w3.x2009.x10.unicorn.observationresponse.ObservationresponseDocument$Factory.parse(Unknown
Source)
org.w3c.unicorn.response.impl.DefaultResponseXBeans.<init>(DefaultResponseXBeans.java:60)
sun.reflect.GeneratedConstructorAccessor714.newInstance(Unknown Source)
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
java.lang.reflect.Constructor.newInstance(Constructor.java:513)
org.w3c.unicorn.response.ResponseFactory.getResponse(ResponseFactory.java:24)
org.w3c.unicorn.request.URIRequest.doRequest(URIRequest.java:141)
org.w3c.unicorn.RequestThread.run(RequestThread.java:66



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