I am not able to make a backup on my server it says the backup has started then the console shows the following error log. Any ideas? Running as a non admin user not as a service on windows server 2012.

[18:37:03] [LocalFileBackupPlugin:Core Info] : Creating Backup: Server
[18:37:03] [LocalFileBackupPlugin:Core Debug] : Building file list...
[18:37:04] [LocalFileBackupPlugin:Core Debug] : File list built: 15214 files totaling 757MB
[18:37:04] [LocalFileBackupPlugin:Core Debug] : Checking cycling requirements...
[18:37:04] [LocalFileBackupPlugin:Core Debug] : Checkpoint ALPHA
[18:37:04] [LocalFileBackupPlugin:Core Debug] : Adding files to archive...
[18:37:08] [LocalFileBackupPlugin:Core Debug] : Saving archive...
[18:37:08] [LocalFileBackupPlugin:Core Debug] : Error writing backup: Index was outside the bounds of the array.
[18:38:13] [LocalFileBackupPlugin:Core Info] : Creating Backup: Server
[18:38:13] [LocalFileBackupPlugin:Core Debug] : Building file list...
[18:38:14] [LocalFileBackupPlugin:Core Debug] : File list built: 15214 files totaling 757MB
[18:38:14] [LocalFileBackupPlugin:Core Debug] : Checking cycling requirements...
[18:38:14] [LocalFileBackupPlugin:Core Debug] : Checkpoint ALPHA
[18:38:14] [LocalFileBackupPlugin:Core Debug] : Adding files to archive...
[18:38:19] [LocalFileBackupPlugin:Core Debug] : Saving archive...
[18:38:19] [LocalFileBackupPlugin:Core Debug] : Error writing backup: Index was outside the bounds of the array.