could not truncate directory "pg_subtrans": apparent wraparound

hello to all,

i found this error in the logs on the hot_standby server. this error
appeared only once a few days back and hasn't come up again. the version i
am using is 9.0.5 and the primary was loaded by restoring dump files
(previous version was 8.4.4). i have never switched to this server and i am
using streaming replication. the activity of the primary is very low, it
creates about 5-10 wal archives every day and has always been like that. the
error does not appear on the primary.

if you need more details about the servers plz tell me and i will post
them.any information that you may have is more than welcome. thx in advance

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