record with incorrect prev-link

Hi,

I'm testing Hot standby with streaming on 9.0RC1 (Debian testing).

I've found this message in my server log (on the standby server) :
...
2010-09-14 11:10:51 CEST ( )LOG: record with incorrect prev-link
1/798BDFC4 at 1/7B8BE010
2010-09-14 11:10:51 CEST ( )FATAL: terminating walreceiver process due
to administrator command
cp: impossible d'évaluer « /opt/wal/00000001000000010000007B »: Aucun
fichier ou dossier de ce type
2010-09-14 11:10:51 CEST ( )LOG: record with incorrect prev-link
1/798BDFC4 at 1/7B8BE010
cp: impossible d'évaluer « /opt/wal/00000001000000010000007B »: Aucun
fichier ou dossier de ce type
2010-09-14 11:10:51 CEST ( )LOG: streaming replication successfully
connected to primary
...
(i'm french, the message "Aucun fichier ou dossier de ce type" = "no
such file or directory")

There is no error on the primary server.

I've google and search archive, but i can't find any reason for this
message.
All work fine, but i'm curious to understand :)

Thx.

Philippe