[Solved] Script Error says Unknown Global although the names are clearly correct

by 


local platform = model.Anchor
local platform = model.start
local platform = model.fin

Here you assign three different values to a local platform. So the first two lines have no effect.

Then you index fin and start in

local distance = fin.Position - start.Position

Where fin and start have never been defined in local or global scope. Hence the error message.

You probably wanted to do something like this:

local start = model.start
local fin = model.fin
local distance = fin.Position - start.Position

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solved Script Error says Unknown Global although the names are clearly correct