Backups fail with error: Object reference not set to an instance of an object

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For rookies like me, here is what the delete command looked like for my situation:

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Selection_062.png734×845 49.6 KB

My first attempts at running the command were flawed by the fact that I cleared out too many of the advanced options. I needed to keep in the dppath and passphrase options.

I also recommend using the --dry-run option first to make sure the command will delete what you think it will!

The command logs looked like this for anyone curious:

Jan 10, 2019 10:00 PM: Result
DeletedSets: [
    Item1: 73
    Item2: 4/6/2018 6:25:30 AM (1523013930)
]
Dryrun: False
MainOperation: Delete
CompactResults:
    DeletedFileCount: 2052
    DownloadedFileCount: 0
    UploadedFileCount: 0
    DeletedFileSize: 53796673940
    DownloadedFileSize: 0
    UploadedFileSize: 0
    Dryrun: False
    MainOperation: Compact
    ParsedResult: Success
    Version: 2.0.4.5 (2.0.4.5_beta_2018-11-28)
    EndTime: 1/10/2019 10:00:43 PM (1547179243)
    BeginTime: 1/10/2019 9:35:40 PM (1547177740)
    Duration: 00:25:02.7467920
    Messages: [
        2019-01-10 21:29:31 -06 - [Information-Duplicati.Library.Main.Controller-StartingOperation]: The operation Delete has started,
        2019-01-10 21:29:35 -06 - [Information-Duplicati.Library.Main.BasicResults-BackendEvent]: Backend event: List - Started:  (),
        2019-01-10 21:30:23 -06 - [Information-Duplicati.Library.Main.BasicResults-BackendEvent]: Backend event: List - Completed:  (55.06 KB),
        2019-01-10 21:30:25 -06 - [Information-Duplicati.Library.Main.Operation.DeleteHandler-DeleteRemoteFileset]: Deleting 1 remote fileset(s) ...,
        2019-01-10 21:35:39 -06 - [Information-Duplicati.Library.Main.BasicResults-BackendEvent]: Backend event: Delete - Started: duplicati-20180406T112530Z.dlist.zip.aes (20.12 MB),
...
    ]
    Warnings: []
    Errors: []
    BackendStatistics:
        RemoteCalls: 2054
        BytesUploaded: 0
        BytesDownloaded: 0
        FilesUploaded: 0
        FilesDownloaded: 0
        FilesDeleted: 2053
        FoldersCreated: 0
        RetryAttempts: 0
        UnknownFileSize: 20594688
        UnknownFileCount: 1
        KnownFileCount: 56380
        KnownFileSize: 1476753186748
        LastBackupDate: 11/30/2018 12:00:00 AM (1543557600)
        BackupListCount: 74
        TotalQuotaSpace: 0
        FreeQuotaSpace: 0
        AssignedQuotaSpace: -1
        ReportedQuotaError: False
        ReportedQuotaWarning: False
        ParsedResult: Success
        Version: 2.0.4.5 (2.0.4.5_beta_2018-11-28)
        Messages: [
            2019-01-10 21:29:31 -06 - [Information-Duplicati.Library.Main.Controller-StartingOperation]: The operation Delete has started,
            2019-01-10 21:29:35 -06 - [Information-Duplicati.Library.Main.BasicResults-BackendEvent]: Backend event: List - Started:  (),
            2019-01-10 21:30:23 -06 - [Information-Duplicati.Library.Main.BasicResults-BackendEvent]: Backend event: List - Completed:  (55.06 KB),
            2019-01-10 21:30:25 -06 - [Information-Duplicati.Library.Main.Operation.DeleteHandler-DeleteRemoteFileset]: Deleting 1 remote fileset(s) ...,
            2019-01-10 21:35:39 -06 - [Information-Duplicati.Library.Main.BasicResults-BackendEvent]: Backend event: Delete - Started: duplicati-20180406T112530Z.dlist.zip.aes (20.12 MB),
...
        ]
        Warnings: []
        Errors: []
ParsedResult: Success
Version: 2.0.4.5 (2.0.4.5_beta_2018-11-28)
EndTime: 1/10/2019 10:00:43 PM (1547179243)
BeginTime: 1/10/2019 9:29:31 PM (1547177371)
Duration: 00:31:12.2504620
Messages: [
    2019-01-10 21:29:31 -06 - [Information-Duplicati.Library.Main.Controller-StartingOperation]: The operation Delete has started,
    2019-01-10 21:29:35 -06 - [Information-Duplicati.Library.Main.BasicResults-BackendEvent]: Backend event: List - Started:  (),
    2019-01-10 21:30:23 -06 - [Information-Duplicati.Library.Main.BasicResults-BackendEvent]: Backend event: List - Completed:  (55.06 KB),
    2019-01-10 21:30:25 -06 - [Information-Duplicati.Library.Main.Operation.DeleteHandler-DeleteRemoteFileset]: Deleting 1 remote fileset(s) ...,
    2019-01-10 21:35:39 -06 - [Information-Duplicati.Library.Main.BasicResults-BackendEvent]: Backend event: Delete - Started: duplicati-20180406T112530Z.dlist.zip.aes (20.12 MB),
...
]
Warnings: []
Errors: []

Hopefully it helps someone!

Also, for the moderators here… Should I change the title of my thread to more accurately reflect the true root cause? The “Object reference” error was not the true source of the issue… Just curious about best practices on that part… Thanks

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