Backup job completes with errors regarding removal of shadow copy set

Hi,

We are experiencing an issue where the backup job completes but with errors.

The error relates to a backup job shadow copy not being removed.

Error is below.

Does anybody know how to clear this error up?

I have removed IR sessions that these relate to but the error persists.

[Minor] From: OB2BAR_VSSBAR@server.domain "MS Exchange 2010+ Server" Time: 11/08/2015 09:48:10

Failed to import Shadow Copy Set of session '2015/07/23-13:server1'.

[Minor] From: OB2BAR_VSSBAR@server.domain "MS Exchange 2010+ Server" Time: 11/08/2015 09:48:10

[145:578] Backup '2015/07/23-13:server' was not removed.

[Warning] From: OB2BAR_VSSBAR@server.domain "MS Exchange 2010+ Server" Time: 11/08/2015 09:48:32

[145:498] Backup session '2015/07/23-13' on system 'server.domain' was not removed.

Thanks

Paul