My script is not working

[ArmadilloMike]

My script is supposed to add a permission to a player but it is having errors
here is the code i have:

command /permissions <add|remove> <player> <permission>:
    permission: op
    permission message: "You must Be an OP to change permissions"
    aliases: perm
    usage: No sytex error
    executable by: console
    trigger:
        if %arg-1% is "remove":
            remove %arg-3% from %arg-2%'s permissions
        else if %arg-1% is "add"
        add %arg-3% to %arg-2%'s permissions

It gives the error

 

[aswq]

Hello!

add|remove is not a type of argument. <x> must be a type of string; for example, <number>, <text>, <integer>, <player>, etc. However, both add and remove are not strings/types.

To fix this, replace it with <text>, then add a line checking if arg-1 is "x" or "y".