[Rails] error with select helper

Hi everyone,
Maybe you guys can help me with a question. I am
getting an error with an instance variable in a view and a select
list.

<%=select("sub_season","id",@sub_seasons.collect {|s|
[s.sub_season_type,s.id]}) %>

undefined method `id' for #<Array:0x0000010ea334f0>

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