Cannot open a file

[MrSmiley006]

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Hello everybody. I have a problem opening and reading a file using the "Opening a file" code from this repo. When I run the code, an exception is raised (I think it was a TypeError) that says something about indexing a nil value. Any help will be appreciated. Edit: The exception raised was computercraft.errors.LuaException, not TypeError. It says: ['[string "temp["2"].close(); temp["2"] = nil:1: attempt to index field \'2\' (a nil value)']