ERROR: operator does not exist: integer = integer[]

I have the following 

select *
from   employee AS e
where  (e.id) IN  (ARRAY[3,1]);

I have the following mistake
ERROR:  operator does not exist: integer = integer[]
LINE 3: where  (e.id) IN  (ARRAY[3,1]);                     ^
HINT:  No operator matches the given name and argument type(s). You might
need to add explicit type casts.

********** Error **********

ERROR: operator does not exist: integer = integer[]
SQL state: 42883
Hint: No operator matches the given name and argument type(s). You might
need to add explicit type casts.
Character: 45


Can anybody explain me?


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