code: function(requestId, exceptionMessage, exceptionType, exceptionData) {
  		return writeExtendedException(requestId, metadataMethods.NOTIFY_NEW_SESSION, exceptionMessage, exceptionType, exceptionData);
  	}
docs: Encodes an unsuccessful notify new session reply.
  
  @param {String} requestId the originating request id
  @param {String} exceptionMessage the exception message
  @param {String} [exceptionType] the exception type. Allowed values: notification, credits, conflictingSession
  @param {Object} [exceptionData] extra information which depends on the exception type
  @return {String} the encoded message
  @private