Error 1400 while performing backup

Hi,

first off, I think Duplicati is pretty great software, to all the developers who made it a reality, thank you.
Second, I ran into a problem while performing test backups to see if the software really fits my needs.

The log of the error backup job is as follows:
DeletedFiles: 35
DeletedFolders: 0
ModifiedFiles: 172
ExaminedFiles: 119774
OpenedFiles: 88170
AddedFiles: 549
SizeOfModifiedFiles: 1090033097
SizeOfAddedFiles: 94986235
SizeOfExaminedFiles: 129921449597
SizeOfOpenedFiles: 102405619052
NotProcessedFiles: 0
AddedFolders: 142
TooLargeFiles: 0
FilesWithError: 0
ModifiedFolders: 0
ModifiedSymlinks: 0
AddedSymlinks: 0
DeletedSymlinks: 0
PartialBackup: False
Dryrun: False
MainOperation: Backup
CompactResults: null
DeleteResults:
DeletedSets:
Dryrun: False
MainOperation: Delete
CompactResults: null
ParsedResult: Error
Version: 2.0.4.5 (2.0.4.5_beta_2018-11-28)
EndTime: 11.03.2019. 10:57:29 (1552298249)
BeginTime: 11.03.2019. 10:57:20 (1552298240)
Duration: 00:00:09.3888548
Messages: [
2019-03-11 10:38:55 +01 - [Information-Duplicati.Library.Main.Controller-StartingOperation]: The operation Backup has started,
2019-03-11 10:39:13 +01 - [Information-Duplicati.Library.Main.BasicResults-BackendEvent]: Backend event: List - Started: (),
2019-03-11 10:39:13 +01 - [Information-Duplicati.Library.Main.BasicResults-BackendEvent]: Backend event: List - Completed: (152 bytes),
2019-03-11 10:56:53 +01 - [Information-Duplicati.Library.Main.BasicResults-BackendEvent]: Backend event: Put - Started: duplicati-b0980e9ab44ef4242bc47c307e8b52f4b.dblock.zip.aes (330.81 MB),
2019-03-11 10:57:19 +01 - [Information-Duplicati.Library.Main.BasicResults-BackendEvent]: Backend event: Put - Completed: duplicati-b0980e9ab44ef4242bc47c307e8b52f4b.dblock.zip.aes (330.81 MB),

]
Warnings: [
2019-03-11 10:39:10 +01 - [Warning-Duplicati.Library.Main.Operation.Backup.FileEnumerationProcess-FileAccessError]: Error reported while accessing file: C:\Users\Mario\AppData\Local\ElevatedDiagnostics,
2019-03-11 10:39:10 +01 - [Warning-Duplicati.Library.Main.Operation.Backup.FileEnumerationProcess-FileAccessError]: Error reported while accessing file: C:\Users\Mario\AppData\Local\ElevatedDiagnostics,
2019-03-11 10:41:21 +01 - [Warning-Duplicati.Library.Main.Operation.Backup.FileBlockProcessor.FileEntry-PathProcessingFailed]: Failed to process path: C:\Users\Mario\AppData\Local\Packages\Microsoft.BingWeather_8wekyb3d8bbwe\Settings\settings.dat,
2019-03-11 10:41:26 +01 - [Warning-Duplicati.Library.Main.Operation.Backup.FileBlockProcessor.FileEntry-PathProcessingFailed]: Failed to process path: C:\Users\Mario\AppData\Local\Microsoft\Windows\UsrClass.dat,
2019-03-11 10:41:26 +01 - [Warning-Duplicati.Library.Main.Operation.Backup.FileBlockProcessor.FileEntry-PathProcessingFailed]: Failed to process path: C:\Users\Mario\AppData\Local\Microsoft\Windows\Notifications\WPNPRMRY.tmp,

]
Errors: [
2019-03-11 10:42:57 +01 - [Error-Duplicati.Library.Main.Database.LocalBackupDatabase-CheckingErrorsForIssue1400]: Checking errors, related to #1400. Unexpected result count: 0, expected 1, hash: b/VoFhEcOW89yGaJSy5DUA4jtDj+QlwVCRQ/xTt9G7Y=, size: 41808, blocksetid: 321143, ix: 397, fullhash: S62ECPhwXf+cMx1cceSPPokCOqXAf05A3wnNyR2GZEQ=, fullsize: 40694608,
2019-03-11 10:42:57 +01 - [Error-Duplicati.Library.Main.Database.LocalBackupDatabase-FoundIssue1400Error]: Found block with ID 1566866 and hash b/VoFhEcOW89yGaJSy5DUA4jtDj+QlwVCRQ/xTt9G7Y= and size 37704
]
BackendStatistics:
RemoteCalls: 8
BytesUploaded: 359095271
BytesDownloaded: 1095342727
FilesUploaded: 3
FilesDownloaded: 3
FilesDeleted: 0
FoldersCreated: 0
RetryAttempts: 0
UnknownFileSize: 0
UnknownFileCount: 0
KnownFileCount: 155
KnownFileSize: 75365459247
LastBackupDate: 11.03.2019. 10:38:55 (1552297135)
BackupListCount: 7
TotalQuotaSpace: 0
FreeQuotaSpace: 0
AssignedQuotaSpace: -1
ReportedQuotaError: False
ReportedQuotaWarning: False
ParsedResult: Error
Version: 2.0.4.5 (2.0.4.5_beta_2018-11-28)
Messages: [
2019-03-11 10:38:55 +01 - [Information-Duplicati.Library.Main.Controller-StartingOperation]: The operation Backup has started,
2019-03-11 10:39:13 +01 - [Information-Duplicati.Library.Main.BasicResults-BackendEvent]: Backend event: List - Started: (),
2019-03-11 10:39:13 +01 - [Information-Duplicati.Library.Main.BasicResults-BackendEvent]: Backend event: List - Completed: (152 bytes),
2019-03-11 10:56:53 +01 - [Information-Duplicati.Library.Main.BasicResults-BackendEvent]: Backend event: Put - Started: duplicati-b0980e9ab44ef4242bc47c307e8b52f4b.dblock.zip.aes (330.81 MB),
2019-03-11 10:57:19 +01 - [Information-Duplicati.Library.Main.BasicResults-BackendEvent]: Backend event: Put - Completed: duplicati-b0980e9ab44ef4242bc47c307e8b52f4b.dblock.zip.aes (330.81 MB),

]
Warnings: [
2019-03-11 10:39:10 +01 - [Warning-Duplicati.Library.Main.Operation.Backup.FileEnumerationProcess-FileAccessError]: Error reported while accessing file: C:\Users\Mario\AppData\Local\ElevatedDiagnostics,
2019-03-11 10:39:10 +01 - [Warning-Duplicati.Library.Main.Operation.Backup.FileEnumerationProcess-FileAccessError]: Error reported while accessing file: C:\Users\Mario\AppData\Local\ElevatedDiagnostics,
2019-03-11 10:41:21 +01 - [Warning-Duplicati.Library.Main.Operation.Backup.FileBlockProcessor.FileEntry-PathProcessingFailed]: Failed to process path: C:\Users\Mario\AppData\Local\Packages\Microsoft.BingWeather_8wekyb3d8bbwe\Settings\settings.dat,
2019-03-11 10:41:26 +01 - [Warning-Duplicati.Library.Main.Operation.Backup.FileBlockProcessor.FileEntry-PathProcessingFailed]: Failed to process path: C:\Users\Mario\AppData\Local\Microsoft\Windows\UsrClass.dat,
2019-03-11 10:41:26 +01 - [Warning-Duplicati.Library.Main.Operation.Backup.FileBlockProcessor.FileEntry-PathProcessingFailed]: Failed to process path: C:\Users\Mario\AppData\Local\Microsoft\Windows\Notifications\WPNPRMRY.tmp,

]
Errors: [
2019-03-11 10:42:57 +01 - [Error-Duplicati.Library.Main.Database.LocalBackupDatabase-CheckingErrorsForIssue1400]: Checking errors, related to #1400. Unexpected result count: 0, expected 1, hash: b/VoFhEcOW89yGaJSy5DUA4jtDj+QlwVCRQ/xTt9G7Y=, size: 41808, blocksetid: 321143, ix: 397, fullhash: S62ECPhwXf+cMx1cceSPPokCOqXAf05A3wnNyR2GZEQ=, fullsize: 40694608,
2019-03-11 10:42:57 +01 - [Error-Duplicati.Library.Main.Database.LocalBackupDatabase-FoundIssue1400Error]: Found block with ID 1566866 and hash b/VoFhEcOW89yGaJSy5DUA4jtDj+QlwVCRQ/xTt9G7Y= and size 37704
]
RepairResults: null
TestResults:
MainOperation: Test
Verifications: [
Key: duplicati-20190309T120946Z.dlist.zip.aes
Value: ,
Key: duplicati-i81a502d950e746928a9b91681b1f8bf9.dindex.zip.aes
Value: ,
Key: duplicati-b5899ee105e684d769ee94911bff951ad.dblock.zip.aes
Value:
]
ParsedResult: Error
Version: 2.0.4.5 (2.0.4.5_beta_2018-11-28)
EndTime: 11.03.2019. 10:57:42 (1552298262)
BeginTime: 11.03.2019. 10:57:29 (1552298249)
Duration: 00:00:12.8353137
Messages: [
2019-03-11 10:38:55 +01 - [Information-Duplicati.Library.Main.Controller-StartingOperation]: The operation Backup has started,
2019-03-11 10:39:13 +01 - [Information-Duplicati.Library.Main.BasicResults-BackendEvent]: Backend event: List - Started: (),
2019-03-11 10:39:13 +01 - [Information-Duplicati.Library.Main.BasicResults-BackendEvent]: Backend event: List - Completed: (152 bytes),
2019-03-11 10:56:53 +01 - [Information-Duplicati.Library.Main.BasicResults-BackendEvent]: Backend event: Put - Started: duplicati-b0980e9ab44ef4242bc47c307e8b52f4b.dblock.zip.aes (330.81 MB),
2019-03-11 10:57:19 +01 - [Information-Duplicati.Library.Main.BasicResults-BackendEvent]: Backend event: Put - Completed: duplicati-b0980e9ab44ef4242bc47c307e8b52f4b.dblock.zip.aes (330.81 MB),

]
Warnings: [
2019-03-11 10:39:10 +01 - [Warning-Duplicati.Library.Main.Operation.Backup.FileEnumerationProcess-FileAccessError]: Error reported while accessing file: C:\Users\Mario\AppData\Local\ElevatedDiagnostics,
2019-03-11 10:39:10 +01 - [Warning-Duplicati.Library.Main.Operation.Backup.FileEnumerationProcess-FileAccessError]: Error reported while accessing file: C:\Users\Mario\AppData\Local\ElevatedDiagnostics,
2019-03-11 10:41:21 +01 - [Warning-Duplicati.Library.Main.Operation.Backup.FileBlockProcessor.FileEntry-PathProcessingFailed]: Failed to process path: C:\Users\Mario\AppData\Local\Packages\Microsoft.BingWeather_8wekyb3d8bbwe\Settings\settings.dat,
2019-03-11 10:41:26 +01 - [Warning-Duplicati.Library.Main.Operation.Backup.FileBlockProcessor.FileEntry-PathProcessingFailed]: Failed to process path: C:\Users\Mario\AppData\Local\Microsoft\Windows\UsrClass.dat,
2019-03-11 10:41:26 +01 - [Warning-Duplicati.Library.Main.Operation.Backup.FileBlockProcessor.FileEntry-PathProcessingFailed]: Failed to process path: C:\Users\Mario\AppData\Local\Microsoft\Windows\Notifications\WPNPRMRY.tmp,

]
Errors: [
2019-03-11 10:42:57 +01 - [Error-Duplicati.Library.Main.Database.LocalBackupDatabase-CheckingErrorsForIssue1400]: Checking errors, related to #1400. Unexpected result count: 0, expected 1, hash: b/VoFhEcOW89yGaJSy5DUA4jtDj+QlwVCRQ/xTt9G7Y=, size: 41808, blocksetid: 321143, ix: 397, fullhash: S62ECPhwXf+cMx1cceSPPokCOqXAf05A3wnNyR2GZEQ=, fullsize: 40694608,
2019-03-11 10:42:57 +01 - [Error-Duplicati.Library.Main.Database.LocalBackupDatabase-FoundIssue1400Error]: Found block with ID 1566866 and hash b/VoFhEcOW89yGaJSy5DUA4jtDj+QlwVCRQ/xTt9G7Y= and size 37704
]
ParsedResult: Error
Version: 2.0.4.5 (2.0.4.5_beta_2018-11-28)
EndTime: 11.03.2019. 10:57:42 (1552298262)
BeginTime: 11.03.2019. 10:38:55 (1552297135)
Duration: 00:18:47.4146507
Messages: [
2019-03-11 10:38:55 +01 - [Information-Duplicati.Library.Main.Controller-StartingOperation]: The operation Backup has started,
2019-03-11 10:39:13 +01 - [Information-Duplicati.Library.Main.BasicResults-BackendEvent]: Backend event: List - Started: (),
2019-03-11 10:39:13 +01 - [Information-Duplicati.Library.Main.BasicResults-BackendEvent]: Backend event: List - Completed: (152 bytes),
2019-03-11 10:56:53 +01 - [Information-Duplicati.Library.Main.BasicResults-BackendEvent]: Backend event: Put - Started: duplicati-b0980e9ab44ef4242bc47c307e8b52f4b.dblock.zip.aes (330.81 MB),
2019-03-11 10:57:19 +01 - [Information-Duplicati.Library.Main.BasicResults-BackendEvent]: Backend event: Put - Completed: duplicati-b0980e9ab44ef4242bc47c307e8b52f4b.dblock.zip.aes (330.81 MB),

]
Warnings: [
2019-03-11 10:39:10 +01 - [Warning-Duplicati.Library.Main.Operation.Backup.FileEnumerationProcess-FileAccessError]: Error reported while accessing file: C:\Users\Mario\AppData\Local\ElevatedDiagnostics,
2019-03-11 10:39:10 +01 - [Warning-Duplicati.Library.Main.Operation.Backup.FileEnumerationProcess-FileAccessError]: Error reported while accessing file: C:\Users\Mario\AppData\Local\ElevatedDiagnostics,
2019-03-11 10:41:21 +01 - [Warning-Duplicati.Library.Main.Operation.Backup.FileBlockProcessor.FileEntry-PathProcessingFailed]: Failed to process path: C:\Users\Mario\AppData\Local\Packages\Microsoft.BingWeather_8wekyb3d8bbwe\Settings\settings.dat,
2019-03-11 10:41:26 +01 - [Warning-Duplicati.Library.Main.Operation.Backup.FileBlockProcessor.FileEntry-PathProcessingFailed]: Failed to process path: C:\Users\Mario\AppData\Local\Microsoft\Windows\UsrClass.dat,
2019-03-11 10:41:26 +01 - [Warning-Duplicati.Library.Main.Operation.Backup.FileBlockProcessor.FileEntry-PathProcessingFailed]: Failed to process path: C:\Users\Mario\AppData\Local\Microsoft\Windows\Notifications\WPNPRMRY.tmp,

]
Errors: [
2019-03-11 10:42:57 +01 - [Error-Duplicati.Library.Main.Database.LocalBackupDatabase-CheckingErrorsForIssue1400]: Checking errors, related to #1400. Unexpected result count: 0, expected 1, hash: b/VoFhEcOW89yGaJSy5DUA4jtDj+QlwVCRQ/xTt9G7Y=, size: 41808, blocksetid: 321143, ix: 397, fullhash: S62ECPhwXf+cMx1cceSPPokCOqXAf05A3wnNyR2GZEQ=, fullsize: 40694608,
2019-03-11 10:42:57 +01 - [Error-Duplicati.Library.Main.Database.LocalBackupDatabase-FoundIssue1400Error]: Found block with ID 1566866 and hash b/VoFhEcOW89yGaJSy5DUA4jtDj+QlwVCRQ/xTt9G7Y= and size 37704
]

Any idea what’s wrong with the setup? I had some minor problems at first, the backup task not wanting to transfer some files due to intermittent issues but these were resolved quickly as I understood exactly what was the error from the log.