Backup Maintenance Job Abort

Until several days ago I had the SQL Server maintenance
job run daily without a problem. I am able to create a
backup from the MARK database manaully from SQL Server GUI
on the same drive as the maintenance job without a problem.
Please help me resolve the problem.
Thanks,
Dan
Aborted in the SQL Server Backup Maintenance on the VERIFY
DATABASE step:
[Microsoft SQL-DMO (ODBC SQLState: 42000)] Error 3201:
[Microsoft][ODBC SQL Server Driver][SQL Server]Cannot open
backup
device 'K:\dumpfiles\MARK\MARK_db_200406170903.BAK'.
Device error or device off-line. See the SQL Server error
log for more details.
[Microsoft][ODBC SQL Server Driver][SQL Server]VERIFY
DATABASE is terminating abnormally.
SQL Server Errorlog Backup Failed:
BackupDiskFile::OpenMedia: Backup
device 'K:\dumpfiles\MARK\MARK_db_200406170903.BAK' failed
to open. Operating system error = 2(The system cannot find
the file specified.).
I executed statement listed below in the Query Analyzer
created the backup file without a problem.
BACKUP DATABASE [MARK] TO DISK
= 'K:\dumpfiles\MARK\MARK_db_200406170803.BAK' WITH
NOINIT , NOUNLOAD , NAME = N'STARUAT backup', NOSKIP ,
STATS = 10, NOFORMATThe error seems during a verify stage. Can you run a RESTORE VERIFYONLY on
the backup created, from Query analyser?
thanks.
Vikram Jayaram
Microsoft, SQL Server
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