Failed to backup "DB1" database with "Full" backup type: Enum objects failed for Database 'DB1'. > Operation not supported on version 10.50.6000

My database is MSSQL server 2008 R2 (SP2) Express Edition. I success backup before but from today now, it is show in error as follows.

• 12:20:00 : Starting scheduled job “5. XX-DB Backp” - “Full”. Server “XX-BACKUP”. System account “Admin@XX-BACKUP”. App v.“12.7.35”.
• 12:20:00 : Connecting to “Remote SQL Server”: “XXX.XXX.XXX.XXX, XXXXX”.
• 12:20:00 : Connected to “2008 R2 SP3 Express Edition”.
• 12:20:00 : The backup folder “C:\Users\Admin\AppData\Local\Temp\Pranas.NET\SBF\bbb66523-c89c-4192-b999-f5d3886008de\backup” has “483.81GB” free space. The temporary folder “C:\Users\Admin\AppData\Local\Temp\Pranas.NET\SBF\bbb66523-c89c-4192-b999-f5d3886008de” has “483.81GB” free space.
• 12:20:00 : Backing up “XXX.XXX.XXX.XXX, XXXXX” Remote SQL Server databases.
• 12:20:00 : Backing up “XXX” with “Full” backup type.
• 12:20:00 : ERROR: Failed to backup “XXX” database with “Full” backup type: Enum objects failed for Database ‘XXX’. > Operation not supported on version 10.50.6000.
• 12:20:01 : Cleaning up backups of “5. XXX-DB Backp” job.
• 12:20:01 : Deleting temporary files.
• 12:20:01 : ERROR: Job “5. XXX-DB Backp” finished with “1” errors.

Hello,

Thank you for your message. Could you please contact our support team at support@sqlbackupandftp.com so we can assist you further?