mobileok error

class java.io.IOException
Server returned HTTP response code: 502 for URL:
http://validator.w3.org/mobile/check?docAddr=http%3A%2F%2Fmicha.seiler-gerstmann.de&output=unicorn
sun.reflect.GeneratedConstructorAccessor26.newInstance(Unknown Source)
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
java.lang.reflect.Constructor.newInstance(Constructor.java:526)
sun.net.www.protocol.http.HttpURLConnection$6.run(HttpURLConnection.java:1676)
sun.net.www.protocol.http.HttpURLConnection$6.run(HttpURLConnection.java:1674)
java.security.AccessController.doPrivileged(Native Method)
sun.net.www.protocol.http.HttpURLConnection.getChainedException(HttpURLConnection.java:1672)
sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1245)
org.w3c.unicorn.request.URIRequest.doRequest(URIRequest.java:141)
org.w3c.unicorn.RequestThread.run(RequestThread.java:66)


best regards micha