Quickbooks Web Connector Error: QBWC1012

We’re having this error message periodically in the QB Web Connector, can you help?: Version: Not provided by service Message: Authentication failed Description: QBWC1012: Authentication failed due to following error message. java.rmi.RemoteException: servie error:; nested exception is: com.avankia.appmashups.soap.DBSyncException: com.avankia.appmashups.soap.DBSyncException: org.jdom.input.JDOMParseException: Error on line 4: White spaces are required between publicId and systemId. See QWCLog for more details. Remember to turn logging on.