could not open temporary statistics file "pg_stat_tmp/pgstat.tmp"

Hi,
We have postgresql9.0 in our Linux server. We are continously getting "could
not open temporary statistics file "pg_stat_tmp/pgstat.tmp": No such file or
directory" message in the db log file.We have data/pg_stat_tmp directory in,
but pgstat.tmp file is not ppresent in this directory.Can someone tell us
why this error messgae is logged?

Thanks.


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