pg_upgrade fails to restore function

Hi All

During the pg_upgrade from PostgreSQL 9.4 to PostgreSQL 10.0, the error”[archiver (db)] Error while PROCESSING TOC:” happened, The upgrade failed. OS is RHEL 6.5 , The error is as below:

<pg_upgrade log>

pg_restore: creating pg_largeobject "pg_largeobject"

pg_restore: creating pg_largeobject_metadata "pg_largeobject_metadata"

pg_restore: creating SCHEMA "bo_user0300"

pg_restore: creating SCHEMA "d0007359_bex2018"

pg_restore: creating SCHEMA "d0007359_dan2014" 

---- omit ------

---- omit ------

---- omit ------

pg_restore: creating PROCEDURE "zchuo_ult18.kp_delkakeihyo(character)"

pg_restore: creating FOREIGN DATA WRAPPER "dblink_fdw"

pg_restore: [archiver (db)] Error while PROCESSING TOC:

pg_restore: [archiver (db)] Error from TOC entry 470023; 2328 777028 FOREIGN DATA WRAPPER dblink_fdw postgres

pg_restore: [archiver (db)] could not execute query: ERROR:  function dblink_fdw_validator(text[], oid) does not exist

   Command was: CREATE FOREIGN DATA WRAPPER "dblink_fdw" VALIDATOR "dblink_fdw_validator";

-- For binary upgrade, handle extension membership the hard way

ALTER EXTENSION "dblink" ADD FOREIGN DATA WRAPPER "dblink_fdw";

Please help to let me know how to address this error? 
I appreciate your quick response. Thank you!

Regards,
Roger