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getting var from for loop


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Hi, could anyone explain why the "id" var cant be accesed right after the for loop. It always get me an error:

"Bad argument @ 'outputChatBox'"

when i trace the id inside the for loop it does work..

for num = 1,amount do 
    if (getDistanceBetweenPoints3D(cords[num].x, cords[num].y, cords[num].z, x, y, z) < getDistanceBetweenPoints3D(cords[num-1].x, cords[num-1].y, cords[num-1].z, x, y, z)) then 
        local id = cords[num].Id 
outputChatBox(id, source) 

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