Question: i make a view in sql server and throw an error:

```
USE BaseDeDatos;

CREATE VIEW TEMAS_USUARIO
AS 
SELECT TOP 5 t.id_userTopic, t.nameTopic, u.id_user, u.name
FROM Topic t, Users u
WHERE t.id_userTopic = u.id_group
ORDER BY t.id_topic DESC;

```

what is wrong whit the syntax?
error ---> CREATE VIEW TEMAS\_USUARIO
can´t use LIMIT

Answer: 
This unfortunately was a mistake in our tutorial. 

Indeed you need to add two properties to `Grid.h`:

```
@property (nonatomic, assign) int totalAlive;
@property (nonatomic, assign) int generation;

```

Instead of adding instance variables to `Grid.m`.

The tutorial has now been updated: <https://www.makegameswith.us/tutorials/game-of-life-spritebuilder/game-of-life-code/>

You can also find the entire code for the solution on GitHub:
<https://github.com/MakeGamesWithUs/GameOfLife.spritebuilder>

Sorry for the inconvenience!
The error message is telling you that there is no property named `generation` for the class `Grid`. Perhaps you are getting confused with accessing properties directly with a leading "\_" vs "self.". 

Insure that such a property exists. Update the question to show th declarations of the missing properties.

Just use the property setters and getters instead of directly accessing them. Declare all ivars as properties. That creates consistence and reduces errors.