BUG #4679: invalid UTF-8 byte sequence detected near byte 0xa3 + postgresql

The following bug has been logged online:

Bug reference:      4679
Logged by:          Bhajesh
Email address:      bbhajesh@zeomega.com
PostgreSQL version: 8.1
Operating system:   red hat linux 9
Description:        invalid UTF-8 byte sequence detected near byte 0xa3  +
postgresql
Details:

Hi

   My previous server database encoding was SQL_ASCII.i took the backup in
UTF8 encoding.when i was going to restore the backup in new server whose
encoding is UTF-8 it is throwing some error like "invalid UTF-8 byte
sequence detected near byte 0xa3".When i tried to restore same server then
also it is showing same error.I don't know why it is happening please help
me.