CC Mekanism Radiation Warning

PLAYER_DETECTOR_SIDE = "RIGHT"
CHAT_BOX_SIDE = "LEFT"
INCIDENT_DIMENSION = "minecraft:overworld"
INCIDENT_POS = {x=0, y=0, z=0}
INCIDENT_RADIUS = 10

function euclideanDistance(pos1, pos2)
    return math.sqrt((pos2.x - pos1.x)^2 + (pos2.y - pos1.y)^2 + (pos2.z - pos1.z)^2)
end

playerDetector = peripheral.wrap(PLAYER_DETECTOR_SIDE)
chatBox = peripheral.wrap(CHAT_BOX_SIDE)

if playerDetector == nil or chatBox == nil then
    error('ERROR - Invalid peripheral sides.')
end

while(true)
do
    onlinePlayers = playerDetector.getOnlinePlayers()
    for playerIndex = 1, #onlinePlayers do
        local playerName = onlinePlayers[playerIndex]
        local playerPos = playerDetector.getPlayerPos(playerName)
        if playerPos ~= nil and playerPos.dimension == INCIDENT_DIMENSION then
            if euclideanDistance(playerPos, INCIDENT_POS) <= INCIDENT_RADIUS then
                chatBox.sendMessageToPlayer("You are now entering a radiation area. Please put on a Hazmat suit.", playerName, "WARNING")
            end
        end
    end
    sleep(5)
end