"npc not moving to waypoint pls fix"

It seems like the NPC is not moving because the `walkTo()` function is not being called correctly in the `patrol()` function. Here's how you can fix it:

```lua
local function patrol()
    local waypoints = workspace.Zombie.Waypoints:GetChildren()
    local randomNum = math.random(1, #waypoints)
    local destination = waypoints[randomNum]
    walkTo(destination)
end
```

In the above script, we are passing the destination waypoint to the `walkTo()` function. Make sure that the `workspace.Zombie.Waypoints` path correctly leads to the waypoints in your game workspace.

Also, ensure that your waypoints are `BasePart` instances (like a Part or a Model's PrimaryPart), as the `walkTo()` function is expecting a `BasePart` as the destination. If your waypoints are not `BasePart` instances, you will need to adjust your script to get the `BasePart` from each waypoint.

If the NPC is still not moving, try debugging by adding print statements in your script to check if the waypoints are being correctly accessed and the `walkTo()` function is being called.