Problem with function

Hi!
Please ; i have a function denfined as:

create function nr_renewLease(varchar(15),interval)
returns integer as '
DECLARE
local_address ALIAS FOR $1;
lease_duration ALIAS FOR $2;
BEGIN
update nr_lease set expires=now()+lease_duration where
address=local_address;
END;
return 1;
'
language 'plpgsql';

when I calle the functions as:

select nr_renewLease('192.168.100.1','20 seconds');

I get the follow error:

ERROR: Function 'nr_renewlease()' does not exist
Unable to identify a function that satisfies the given
argument types
You may need to add explicit typecasts

But I don't know why, since I can see sintaxis of my function
is fine, and the passed arguments are fine, Can you help me,
if exists some detail I am not seeing?

I can see that this error message also appears when a function
that doesn't exists is called, but my function exists!

Thank you.

Regards.

Ernesto Freyre

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