Appending elements to lists 7/11

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My Code:
Replace this line with your code
chess_club[["first_years"]] <- first_years

chess_club[[c("first_years", 2)]]

What I expected to happen:
I expected that this will run properly

What actually happened:

Replace this line with the output/error

Error in chess_club[[c("first_years", 2)]]: subscript out of bounds
Traceback:

According to previous examples in this mission, If i used a positional index in the place of “first _years” the code would have worked. Why it is not working now?