# 2.0.2.9: Backend verification failed, attempting automatic cleanup

**URL:** https://forum.duplicati.com/t/2-0-2-9-backend-verification-failed-attempting-automatic-cleanup/882
**Category:** Support
**Created:** [October 2, 2017, 3:26pm UTC](https://forum.duplicati.com/t/2-0-2-9-backend-verification-failed-attempting-automatic-cleanup/882 "2017-10-02T15:26:38Z")
**Posts on this page:** 1
**Showing post:** 5

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### Author: ![JonMikelV](https://forum.duplicati.com/letter_avatar_proxy/v4/letter/j/439d5e/32.png) [@JonMikelV](https://forum.duplicati.com/u/JonMikelV)
#### Post date: [October 3, 2017, 5:52pm UTC](https://forum.duplicati.com/t/2-0-2-9-backend-verification-failed-attempting-automatic-cleanup/882/5 "2017-10-03T17:52:33Z")

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Thanks for the commandline export - that all looks OK to me (ignoring likely re-formatting issues like the triple-dash before send-mail-url).

It looks like the argument exception may be a common problem with 2.0.2.9 - if you can’t wait until we hear from @kenkendk you might want to consider downgrading to 2.0.2.8, which seems to have worked for some people.

> [@Fatal Error 2.0.2.29 "Object must be a root directory ("C:\\") or a drive letter ("C")"](https://forum.duplicati.com/t/fatal-error-2-0-2-29-object-must-be-a-root-directory-c-or-a-drive-letter-c/888):
>
> \> Fatal error \> System.ArgumentException: Object must be a root directory ("C:\") or a drive letter ("C"). \> \> at System.IO.DriveInfo..ctor(String driveName) \> \> at Duplicati.Library.Backend.File.GetDrive() \> \> at Duplicati.Library.Backend.File.get\_Quota() \> \> at Duplicati.Library.Main.Operation.FilelistProcessor.RemoteListAnalysis(BackendManager backend, Options options, LocalDatabase database, IBackendWriter log, String protectedfile) \> \> at Dupl…

> [@Duplicati 2.0.2.9 won’t start](https://forum.duplicati.com/t/duplicati-2-0-2-9-won-t-start/885/8):
>
> I need to hit a translator tool to be sure, but this seems to be the same as the error mentioned in this topic:

Out of curiosity, does it work any better if you change “C:\Work\” to “C:\Work\” (just add another slash after the colon)?

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_[View the full topic](https://forum.duplicati.com/t/2-0-2-9-backend-verification-failed-attempting-automatic-cleanup/882)._