My Skript Isn't Working

[Strixus17]

This is a game where cactus appear in random locations and the player has to avoid them , but i want to put a significant by making a red sand block appear 1 second before the cactus to warn the player but it's not working

Skript:

Every 3 seconds in "races":
    loop all players in "races":
        loop-player's y coordinate is 64 or 65 or 66
        make loop-player execute command "/fill 1 64 13 -7 64 27 air"
        make loop-player execute command "/fill 1 63 13 -7 63 27 sand"
        loop 10 times:
            set {coordx} to random integer between -7 and 1
            set {coordz} to random integer between 13 and 27
            set {coord} to "%{coordx}%, 63, %{coordz}%"
            set block at location at {coord} in world "races" to red sand
            wait 1 seconds
            set block above location at {coord} in world "races" to cactus

Errors:

 

[FossilOG]

Instead of: set block at location at {coord} in world "races" to red sand
Try: set block at location at %{coord}% in world "races" to red sand
Im not sure If Its going to work

 

[Strixus17]

not working