could not access status of transaction 1118722281

Running 9.0.2 on Centos.

I just discovered this in my production error log.  Starting about 45
minutes ago, I got 70 of these, within 2 seconds:

28652   2011-04-04 21:47:29 EDT [33]WARNING:  PD_ALL_VISIBLE flag was
incorrectly set in relation "pg_toast_49338181" page 16820

These warnings were immediately proceeded by this, which has continuously
repeated every 15 seconds since then:

8895   2011-04-04 22:15:28 EDT [1]ERROR:  could not access status of
transaction 1118722281
8895   2011-04-04 22:15:28 EDT [2]DETAIL:  Could not open file
"pg_clog/042A": No such file or directory.
8895   2011-04-04 22:15:28 EDT [3]CONTEXT:  automatic vacuum of table
"mcore.pg_toast.pg_toast_48975830"

I checked and the pg_clog files start at 04BF and run through 0A57 (1,433
files)

Any help would be greatly appreciated.

Gordon

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