Unable to cast to dictionary - Luau/Roblox Lua - luau

Question

I'm building a game in Roblox and I'm trying to make an NPC go towards the player using PathfindingService, and when the path doesn't work it wanders. However, I keep getting the error message "Unable to cast to Dictionary - Server - Script" and I can't seem to find the source of the issue.
I've checked my code for any tables or dictionaries that may be causing the problem, but I can't seem to find anything. Can anyone help me identify the issue and suggest a possible solution?
local PathfindingService = game:GetService("PathfindingService")
local Players = game:GetService("Players")
local NPC = script.Parent
local TargetPlayer = nil
local Path = nil
local CurrentWaypointIndex = 1
local WaypointReachedDistance = 2
function findTargetPlayer()
local players = Players:GetPlayers()
if #players > 0 then
return players[1]
end
return nil
end
function findPathToTarget()
if not TargetPlayer then
return
end
local humanoid = TargetPlayer.Character and TargetPlayer.Character:FindFirstChild("Humanoid")
if not humanoid then
return
end
local startPosition = NPC.HumanoidRootPart.Position
local endPosition = humanoid.RootPart.Position
Path = PathfindingService:CreatePath(startPosition, endPosition)
Path:ComputeAsync()
if Path.Status == Enum.PathStatus.Success then
CurrentWaypointIndex = 1
else
NPC.Humanoid.WalkToPoint = NPC.HumanoidRootPart.Position + Vector3.new(math.random(-5,5), 0, math.random(-5,5))
end
end
function updateWaypoint()
if not Path or CurrentWaypointIndex > #Path.Waypoints then
return
end
local currentWaypoint = Path.Waypoints[CurrentWaypointIndex]
local distanceToWaypoint = (currentWaypoint - NPC.HumanoidRootPart.Position).Magnitude
if distanceToWaypoint <= WaypointReachedDistance then
CurrentWaypointIndex += 1
end
NPC.Humanoid:MoveTo(NPC.HumanoidRootPart.Position + Vector3.new(math.random(-5,5), 0, math.random(-5,5)))
end
function updateTarget()
TargetPlayer = findTargetPlayer()
if TargetPlayer then
findPathToTarget()
end
end
while true do
updateTarget()
updateWaypoint()
wait(0.1)
end
I've tried various solutions, including changing the variable types and removing potential lists, but nothing has worked so far. I expected the script to run without errors and for the NPC to follow the player.