this is the error I keep getting icons.dm:4:error: expected expression

changed the names to being longer and it worked

turfs
1
icon = 'walls.dmi'
icon_state = "1"
density = 1

2
icon = 'walls.dmi'
icon_state = "2"
density = 1

3
icon = 'walls.dmi'
icon_state = "3"
density = 1

4
icon = 'walls.dmi'
icon_state = "4"
density = 1

5
icon = 'walls.dmi'
icon_state = "5"
density = 1

6
icon = 'walls.dmi'
icon_state = "6"
density = 1

7
icon = 'walls.dmi'
icon_state = "7"
density = 1

8
icon = 'walls.dmi'
icon_state = "8"
density = 1

9
icon = 'walls.dmi'
icon_state = "9"
density = 1

10
icon = 'walls.dmi'
icon_state = "10"
density = 1

11
icon = 'walls.dmi'
icon_state = "11"
density = 1

12
icon = 'walls.dmi'
icon_state = "12"
density = 1

13
icon = 'walls.dmi'
icon_state = "13"
density = 1

14
icon = 'walls.dmi'
icon_state = "14"
density = 1

15
icon = 'walls.dmi'
icon_state = "15"
density = 1

16
icon = 'walls.dmi'
icon_state = "16"
density = 1

17
icon = 'walls.dmi'
icon_state = "17"
density = 1

18
icon = 'walls.dmi'
icon_state = "18"
density = 1

19
icon = 'walls.dmi'
icon_state = "19"
density = 1

20
icon = 'walls.dmi'
icon_state = "20"
density = 1

21
icon = 'walls.dmi'
icon_state = "21"
density = 1