diff --git a/includes/fillit.h b/includes/fillit.h
index e2c1368..90fafa5 100644
--- a/includes/fillit.h
+++ b/includes/fillit.h
@@ -6,7 +6,7 @@
 /*   By: vmanzoni <vmanzoni@student.42.fr>          +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2019/03/01 13:34:46 by vmanzoni          #+#    #+#             */
-/*   Updated: 2019/04/14 12:13:35 by vmanzoni         ###   ########.fr       */
+/*   Updated: 2019/04/14 12:34:30 by vmanzoni         ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -34,5 +34,6 @@ void	print_test(char *test);
 
 char	*read_file(char *file);
 void	ft_display_error(char *s, int fd);
+int		ft_file_errors(char *file);
 
 #endif
diff --git a/samples/1tetri b/samples/1tetri
new file mode 100644
index 0000000..3f1734a
--- /dev/null
+++ b/samples/1tetri
@@ -0,0 +1,4 @@
+...#
+...#
+...#
+...#
diff --git a/srcs/handle_errors.c b/srcs/handle_errors.c
index 3ba9595..dedfac7 100644
--- a/srcs/handle_errors.c
+++ b/srcs/handle_errors.c
@@ -6,7 +6,7 @@
 /*   By: vmanzoni <vmanzoni@student.42.fr>          +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2019/03/01 13:29:05 by vmanzoni          #+#    #+#             */
-/*   Updated: 2019/04/14 12:06:40 by vmanzoni         ###   ########.fr       */
+/*   Updated: 2019/04/14 12:35:46 by vmanzoni         ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -17,8 +17,25 @@ void	ft_display_error(char *s, int fd)
 	write(fd, s, strlen(s));
 }
 
+int		ft_file_errors(char *file)
+{
+	int		line_nbr;
+
+	line_nbr = 0;
+	while (*file)
+	{
+		if (*file == '\n')
+			line_nbr++;
+		file++;
+	}
+	/*less than 4 lines or more than 104 (26 tetri) + 25 = 129 lines*/
+	if (line_nbr < 4 || line_nbr > 129)
+		return (1);
+	return (0);
+}
+
 /*
-int		ft_tetri_erros()
+int		ft_tetri_errors()
 {
 
 }
diff --git a/srcs/main.c b/srcs/main.c
index 6a379c7..f14e429 100644
--- a/srcs/main.c
+++ b/srcs/main.c
@@ -6,7 +6,7 @@
 /*   By: vmanzoni <vmanzoni@student.42.fr>          +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2019/02/12 13:20:48 by vmanzoni          #+#    #+#             */
-/*   Updated: 2019/04/14 12:13:42 by vmanzoni         ###   ########.fr       */
+/*   Updated: 2019/04/14 12:44:14 by vmanzoni         ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -17,22 +17,28 @@ int		main(int argc, char **argv)
 	char	*input;
 	short	i;
 
-	if (argc == 2)
+	if (argc != 2)
 	{
-		if (!(input = read_file(argv[1])))
-			ft_display_error("Error: Could not read file.\n", 2);
-//		else if (/*Elements in file not valid*/)
-//			ft_display_error("Error: Invalid file.\n", 2);
-		/*
-		Transform input to tetriminos
-		Check if every tetrimino is valid
-		Backtracking for smallest square
-		Transform tetriminos with letters
-		Print result
-		*/
-		print_test(input);
-	}
-	else
 		ft_display_error("Error: Please submit a file.\n", 2);
-	return 0;
+		return (0);
+	}
+	else if (!(input = read_file(argv[1])))
+	{
+		ft_display_error("Error: Could not read file.\n", 2);
+		return (0);
+	}
+	else if (ft_file_errors(input))
+	{
+		ft_display_error("Error: Invalid file.\n", 2);
+		return (0);
+	}
+	/*
+	Check if every tetrimino is valid
+	Transform input to tetriminos
+	Backtracking for smallest square
+	Transform tetriminos with letters
+	Print result
+	*/
+	print_test(input);
+	return (0);
 }