can't start tsearch2 in 8.2.4

When I try to initiate tsearch2 in 8.2.4, I got the following error.

$ psql emedia_db < tsearch2.sql
SET
BEGIN
NOTICE: CREATE TABLE / PRIMARY KEY will create implicit index
"pg_ts_dict_pkey" for table "pg_ts_dict"
CREATE TABLE
ERROR: incompatible library "/usr/local/pgsql/lib/tsearch2.so":
missing magic block

..................

Does anyone know if there is a fix available?

Thanks