Backup always errors, rebuild won't work to clear the error, missing file

Now I’m getting a different warning regarding deletion of files:

DeletedFiles: 97
DeletedFolders: 54
ModifiedFiles: 412
ExaminedFiles: 493725
OpenedFiles: 622
AddedFiles: 210
SizeOfModifiedFiles: 1877245464
SizeOfAddedFiles: 4789971
SizeOfExaminedFiles: 312127240506
SizeOfOpenedFiles: 1896047536
NotProcessedFiles: 0
AddedFolders: 67
TooLargeFiles: 0
FilesWithError: 0
ModifiedFolders: 0
ModifiedSymlinks: 0
AddedSymlinks: 5
DeletedSymlinks: 0
PartialBackup: False
Dryrun: False
MainOperation: Backup
CompactResults:
    DeletedFileCount: 2
    DownloadedFileCount: 0
    UploadedFileCount: 0
    DeletedFileSize: 1323066
    DownloadedFileSize: 0
    UploadedFileSize: 0
    Dryrun: False
    MainOperation: Compact
    ParsedResult: Warning
    EndTime: 2018-04-26 10:05:04 AM (1524758704)
    BeginTime: 2018-04-26 10:04:18 AM (1524758658)
    Duration: 00:00:46.1235660
    Messages: [
        2018-04-26 09:47:00 -06 - [Information-Duplicati.Library.Main.Controller-StartingOperation]: The operation Backup has started,
        2018-04-26 09:48:11 -06 - [Information-Duplicati.Library.Main.Operation.FilelistProcessor-RemovingStaleFile]: Removing remote file listed as Deleting: duplicati-b7707650f88a344d394eb83d08f2a7438.dblock.zip.aes,
        2018-04-26 09:48:11 -06 - [Information-Duplicati.Library.Main.BasicResults-BackendEvent]: Backend event: Delete - Started: duplicati-b7707650f88a344d394eb83d08f2a7438.dblock.zip.aes (),
        2018-04-26 09:48:28 -06 - [Information-Duplicati.Library.Main.BackendManager-DeleteRemoteFileSuccess]: Listing indicates file duplicati-b7707650f88a344d394eb83d08f2a7438.dblock.zip.aes is deleted correctly,
        2018-04-26 09:48:28 -06 - [Information-Duplicati.Library.Main.Operation.FilelistProcessor-RemovingStaleFile]: Removing remote file listed as Deleting: duplicati-i8faf951b9d494d96a6f5c8853aa00a09.dindex.zip.aes,
...
    ]
    Warnings: [
        2018-04-26 09:48:20 -06 - [Warning-Duplicati.Library.Main.BackendManager-DeleteRemoteFileFailed]: Delete operation failed for duplicati-b7707650f88a344d394eb83d08f2a7438.dblock.zip.aes with FileNotFound, listing contents,
        2018-04-26 09:48:35 -06 - [Warning-Duplicati.Library.Main.BackendManager-DeleteRemoteFileFailed]: Delete operation failed for duplicati-i8faf951b9d494d96a6f5c8853aa00a09.dindex.zip.aes with FileNotFound, listing contents
    ]
    Errors: []
    BackendStatistics:
        RemoteCalls: 26
        BytesUploaded: 530233297
        BytesDownloaded: 0
        FilesUploaded: 21
        FilesDownloaded: 0
        FilesDeleted: 3
        FoldersCreated: 0
        RetryAttempts: 0
        UnknownFileSize: 0
        UnknownFileCount: 0
        KnownFileCount: 9474
        KnownFileSize: 239009551588
        LastBackupDate: 2018-04-26 9:47:00 AM (1524757620)
        BackupListCount: 4
        TotalQuotaSpace: 0
        FreeQuotaSpace: 0
        AssignedQuotaSpace: -1
        ReportedQuotaError: False
        ReportedQuotaWarning: False
        ParsedResult: Warning
        Messages: [
            2018-04-26 09:47:00 -06 - [Information-Duplicati.Library.Main.Controller-StartingOperation]: The operation Backup has started,
            2018-04-26 09:48:11 -06 - [Information-Duplicati.Library.Main.Operation.FilelistProcessor-RemovingStaleFile]: Removing remote file listed as Deleting: duplicati-b7707650f88a344d394eb83d08f2a7438.dblock.zip.aes,
            2018-04-26 09:48:11 -06 - [Information-Duplicati.Library.Main.BasicResults-BackendEvent]: Backend event: Delete - Started: duplicati-b7707650f88a344d394eb83d08f2a7438.dblock.zip.aes (),
            2018-04-26 09:48:28 -06 - [Information-Duplicati.Library.Main.BackendManager-DeleteRemoteFileSuccess]: Listing indicates file duplicati-b7707650f88a344d394eb83d08f2a7438.dblock.zip.aes is deleted correctly,
            2018-04-26 09:48:28 -06 - [Information-Duplicati.Library.Main.Operation.FilelistProcessor-RemovingStaleFile]: Removing remote file listed as Deleting: duplicati-i8faf951b9d494d96a6f5c8853aa00a09.dindex.zip.aes,
...
        ]
        Warnings: [
            2018-04-26 09:48:20 -06 - [Warning-Duplicati.Library.Main.BackendManager-DeleteRemoteFileFailed]: Delete operation failed for duplicati-b7707650f88a344d394eb83d08f2a7438.dblock.zip.aes with FileNotFound, listing contents,
            2018-04-26 09:48:35 -06 - [Warning-Duplicati.Library.Main.BackendManager-DeleteRemoteFileFailed]: Delete operation failed for duplicati-i8faf951b9d494d96a6f5c8853aa00a09.dindex.zip.aes with FileNotFound, listing contents
        ]
        Errors: []
DeleteResults:
    DeletedSets: [
        Item1: 1
        Item2: 2018-04-26 2:24:25 AM (1524731065)
    ]
    Dryrun: False
    MainOperation: Delete
    ParsedResult: Warning
    EndTime: 2018-04-26 10:05:04 AM (1524758704)
    BeginTime: 2018-04-26 10:03:20 AM (1524758600)
    Duration: 00:01:44.1386920
    Messages: [
        2018-04-26 09:47:00 -06 - [Information-Duplicati.Library.Main.Controller-StartingOperation]: The operation Backup has started,
        2018-04-26 09:48:11 -06 - [Information-Duplicati.Library.Main.Operation.FilelistProcessor-RemovingStaleFile]: Removing remote file listed as Deleting: duplicati-b7707650f88a344d394eb83d08f2a7438.dblock.zip.aes,
        2018-04-26 09:48:11 -06 - [Information-Duplicati.Library.Main.BasicResults-BackendEvent]: Backend event: Delete - Started: duplicati-b7707650f88a344d394eb83d08f2a7438.dblock.zip.aes (),
        2018-04-26 09:48:28 -06 - [Information-Duplicati.Library.Main.BackendManager-DeleteRemoteFileSuccess]: Listing indicates file duplicati-b7707650f88a344d394eb83d08f2a7438.dblock.zip.aes is deleted correctly,
        2018-04-26 09:48:28 -06 - [Information-Duplicati.Library.Main.Operation.FilelistProcessor-RemovingStaleFile]: Removing remote file listed as Deleting: duplicati-i8faf951b9d494d96a6f5c8853aa00a09.dindex.zip.aes,
...
    ]
    Warnings: [
        2018-04-26 09:48:20 -06 - [Warning-Duplicati.Library.Main.BackendManager-DeleteRemoteFileFailed]: Delete operation failed for duplicati-b7707650f88a344d394eb83d08f2a7438.dblock.zip.aes with FileNotFound, listing contents,
        2018-04-26 09:48:35 -06 - [Warning-Duplicati.Library.Main.BackendManager-DeleteRemoteFileFailed]: Delete operation failed for duplicati-i8faf951b9d494d96a6f5c8853aa00a09.dindex.zip.aes with FileNotFound, listing contents
    ]
    Errors: []
RepairResults: null
TestResults: null
ParsedResult: Warning
EndTime: 2018-04-26 10:05:04 AM (1524758704)
BeginTime: 2018-04-26 9:47:00 AM (1524757620)
Duration: 00:18:03.8017810
Messages: [
    2018-04-26 09:47:00 -06 - [Information-Duplicati.Library.Main.Controller-StartingOperation]: The operation Backup has started,
    2018-04-26 09:48:11 -06 - [Information-Duplicati.Library.Main.Operation.FilelistProcessor-RemovingStaleFile]: Removing remote file listed as Deleting: duplicati-b7707650f88a344d394eb83d08f2a7438.dblock.zip.aes,
    2018-04-26 09:48:11 -06 - [Information-Duplicati.Library.Main.BasicResults-BackendEvent]: Backend event: Delete - Started: duplicati-b7707650f88a344d394eb83d08f2a7438.dblock.zip.aes (),
    2018-04-26 09:48:28 -06 - [Information-Duplicati.Library.Main.BackendManager-DeleteRemoteFileSuccess]: Listing indicates file duplicati-b7707650f88a344d394eb83d08f2a7438.dblock.zip.aes is deleted correctly,
    2018-04-26 09:48:28 -06 - [Information-Duplicati.Library.Main.Operation.FilelistProcessor-RemovingStaleFile]: Removing remote file listed as Deleting: duplicati-i8faf951b9d494d96a6f5c8853aa00a09.dindex.zip.aes,
...
]
Warnings: [
    2018-04-26 09:48:20 -06 - [Warning-Duplicati.Library.Main.BackendManager-DeleteRemoteFileFailed]: Delete operation failed for duplicati-b7707650f88a344d394eb83d08f2a7438.dblock.zip.aes with FileNotFound, listing contents,
    2018-04-26 09:48:35 -06 - [Warning-Duplicati.Library.Main.BackendManager-DeleteRemoteFileFailed]: Delete operation failed for duplicati-i8faf951b9d494d96a6f5c8853aa00a09.dindex.zip.aes with FileNotFound, listing contents
]
Errors: []