[SQL] cache lookup failed

[victor]

Hi,
I have this function:

CREATE FUNCTION add_one (integer) RETURNS integer AS '
BEGIN
RETURN $1 + 1;
END;
' LANGUAGE 'plpgsql';

from postgres doc.
When I try somethin like this: 

SELECT add_one(4);

I get :

ERROR:  fmgr_info: function 20086: cache lookup failed

please tell me what it's rong. 

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