Error! A startup class specified in smack-config.xml could not be loaded

Trying out the google talk wrapper class, it works fine but I’‘m getting these error messages that don’‘t make any sense. First off, I don’‘t have a smack-config.xml anywhere in the classpath, I couldn’'t find anything about this file in the docs, do I need one? Like I said, the chat part works fine, but the error message are annoying. .Any idea? Possibly just a way to suppress them?

Error! A startup class specified in smack-config.xml could not be loaded: org.jivesoftware.smackx.ServiceDiscoveryManager

Error! A startup class specified in smack-config.xml could not be loaded: org.jivesoftware.smackx.XHTMLManager

Error! A startup class specified in smack-config.xml could not be loaded: org.jivesoftware.smackx.muc.MultiUserChat

Error! A startup class specified in smack-config.xml could not be loaded: org.jivesoftware.smackx.filetransfer.FileTransferManager

Error! A startup class specified in smack-config.xml could not be loaded: org.jivesoftware.smackx.ServiceDiscoveryManager

Error! A startup class specified in smack-config.xml could not be loaded: org.jivesoftware.smackx.XHTMLManager

Error! A startup class specified in smack-config.xml could not be loaded: org.jivesoftware.smackx.muc.MultiUserChat

Error! A startup class specified in smack-config.xml could not be loaded: org.jivesoftware.smackx.filetransfer.FileTransferManager