# Fatal error: Detected non-empty blocksets with no associated blocks

**URL:** https://forum.duplicati.com/t/fatal-error-detected-non-empty-blocksets-with-no-associated-blocks/5938
**Category:** Support
**Created:** [January 9, 2019, 5:30am UTC](https://forum.duplicati.com/t/fatal-error-detected-non-empty-blocksets-with-no-associated-blocks/5938 "2019-01-09T05:30:34Z")
**Posts on this page:** 1
**Showing post:** 2

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### Author: ![johnvk](https://forum.duplicati.com/letter_avatar_proxy/v4/letter/j/f17d59/32.png) [@johnvk](https://forum.duplicati.com/u/johnvk)
#### Post date: [January 9, 2019, 4:48pm UTC](https://forum.duplicati.com/t/fatal-error-detected-non-empty-blocksets-with-no-associated-blocks/5938/2 "2019-01-09T16:48:22Z")

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I missed [this post saying now a repair fixes this problem](https://forum.duplicati.com/t/backup-started-failing-non-empty-blocksets-with-no-associated-blocks/3549/4). I did not try a repair.

I don’t understand the internals enough. There’s at least three entities: database, blocksets, and blocks. And dlists? and indexes?

I’m not sure what this error is indicating is broken, and what the various repairs do. Is there one I should try? I’ll try to read up on this when I have time.

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