code: function writeDefaultException(requestId, requestType, exceptionMessage) {
  	return protocol.implodeMessage(requestId, requestType,
  		exceptions.GENERIC,
  		protocol.encodeString(exceptionMessage));
  }
docs: Encodes an unsuccessful reply of an unspecified type.
  
  @param {String} requestId the originating request id
  @param {String} requestType the originating request method name
  @param {String} exceptionMessage the exception message
  @return {String} the encoded message
  @private