invalid byte sequence for encoding "EUC_TW"

Dear Sir,
We use postgresql in our company. We found an error when restoring database. We guess the problem is due to the postgresql version.

Source Database:
- version: Postgresql 7.3.4
- encoding: EUC_TW
- OS: Red Hat 9

Target Database:
- version: Postgresql 7.4.2
- encoding: EUC_TW
- OS: Red Hat 9

Error message when I use the command - psql:

ERROR: invalid byte sequence for encoding "EUC_TW": 0xae61
CONTEXT: COPY items, line 2, column itemdesc: "Raaû?u¡±@¡±{ (?@) QEF01-0301"
ERROR: invalid byte sequence for encoding "EUC_TW": 0xab4f
CONTEXT: COPY old_directprog, line 1, column directprogdesc: "aふY¢XIふYo?O?jÆØI"
ERROR: invalid byte sequence for encoding "EUC_TW": 0xa745
CONTEXT: COPY receipt, line 72, column receivedfrom: "¡±E¡±R?A"

Would you please give us comment on how to solve this problem.
We are looking forward for your reply. Thank you very much!

Eric Tan
>From Hong Kong

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