# Unable to rebuild app

**URL:** <https://meta.discourse.org/t/unable-to-rebuild-app/193349>\
**Category:** Self-hosting\
**Created:** [June 9, 2021, 10:14pm UTC](https://meta.discourse.org/t/unable-to-rebuild-app/193349 "2021-06-09T22:14:43Z")\
**Posts on this page:** 1\
**Showing post:** 4

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**Author:** ![pfaffman](https://sea3.discourse-cdn.com/meta/user_avatar/meta.discourse.org/pfaffman/32/120154_2.png) [@pfaffman](https://meta.discourse.org/u/pfaffman)\
**Post date:** [June 10, 2021, 11:57am UTC](https://meta.discourse.org/t/unable-to-rebuild-app/193349/4 "2021-06-10T11:57:25Z")

</div>

He means a database migration. Upgrades sometimes include changes to the database structure. It looks like that’s what failed (perhaps a corrupt database index or errant plugin, but those are wild guesses).

If you can’t scroll back, just try again. Rather than a screen shot, copying the text is better. And you can paste it between back ticks like

````
 ```
Your stuff here 

 ```

````

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