pb when creating user type

hello
I try to create a type complex, i generate a complex.so and when to insert
one complex into a table i have some problems
please help me


CREATE FUNCTION complex_out(opaque)  RETURNS opaque  AS '/usr/local/pgsql/complex.so'  LANGUAGE 'c';
CREATE

CREATE TYPE complex (  internallength = 16,  input = complex_in,  output = complex_out
);
CREATE


CREATE TABLE test_complex (       a       complex,       b       complex
);
CREATE

INSERT INTO test_complex VALUES ('(1.0, 2.5)', '(4.2, 3.55 )');
ERROR:  Can't find function complex_in in file /usr/local/pgsql/complex.so
ERROR:  Can't find function complex_in in file /usr/local/pgsql/complex.so
INSERT INTO test_complex VALUES ('(33.0, 51.4)', '(100.42, 93.55)');
ERROR:  Can't find function complex_in in file /usr/local/pgsql/complex.so
ERROR:  Can't find function complex_in in file /usr/local/pgsql/complex.so