Critical Error - submitting a bug error as instructed

class java.io.IOException

Server returned HTTP response code: 500 for URL:
http://jigsaw.w3.org/css-validator/validator

sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection
..java:1436)

org.w3c.unicorn.util.ClientHttpRequest.post(ClientHttpRequest.java:397)

org.w3c.unicorn.request.DirectRequestPOST.doRequest(DirectRequestPOST.java:8
1)

org.w3c.unicorn.RequestThread.run(RequestThread.java:66)

 

 

class org.apache.xmlbeans.XmlException
error: Unexpected character encountered (lex state 9): '!'
org.apache.xmlbeans.impl.store.Locale$SaxLoader.load(Locale.java:3486)
org.apache.xmlbeans.impl.store.Locale.parseToXmlObject(Locale.java:1276)
org.apache.xmlbeans.impl.store.Locale.parseToXmlObject(Locale.java:1263)
org.apache.xmlbeans.impl.schema.SchemaTypeLoaderBase.parse(SchemaTypeLoaderB
ase.java:345)
org.w3.x2009.x10.unicorn.observationresponse.ObservationresponseDocument$Fac
tory.parse(Unknown Source)
org.w3c.unicorn.response.impl.DefaultResponseXBeans.<init>(DefaultResponseXB
eans.java:60)
sun.reflect.GeneratedConstructorAccessor22.newInstance(Unknown Source)
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstruc
torAccessorImpl.java:27)
java.lang.reflect.Constructor.newInstance(Constructor.java:513)
org.w3c.unicorn.response.ResponseFactory.getResponse(ResponseFactory.java:24
)
org.w3c.unicorn.request.DirectRequestPOST.doRequest(DirectRequestPOST.java:8
1)
org.w3c.unicorn.RequestThread.run(RequestThread.java:66)