Time Machine backup will not complete

Backup to Time Capsule will not complete.  This just started happening about a month ago.  It used to work fine.  I have tried deleting prior backups and reformatting the Time Capsule.
Thanks,
Ken

Kenneth Epstein wrote:
get an error message in Time Machine about error occurred while copying files:
Error parsing SystemMigration.log to determine source volume of system migration.
That's not really an error message; just a notice that TM doesn't know whether you migrated from another Mac or backups, or did a full system restore.
2012-06-01 07:48:59.367 ReportCrash[1527:2503] Saved crash report for backupd[1518] version ??? (???) to /Library/Logs/DiagnosticReports/backupd_2012-06-01-074858_localhost.crash
Rats.  Backupd crashed again, just as before. The "combo" didn't update whatever's damaged/corrupted. 
Try installing a fresh copy of OSX (that won't disturb anything else), also per Installing the ''combo'' update and/or Reinstalling OSX.

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