# When trying to upgrade: Error running ember build

**URL:** <https://meta.discourse.org/t/when-trying-to-upgrade-error-running-ember-build/220532>\
**Category:** Self-hosting\
**Created:** [March 9, 2022, 5:32pm UTC](https://meta.discourse.org/t/when-trying-to-upgrade-error-running-ember-build/220532 "2022-03-09T17:32:46Z")\
**Posts on this page:** 1\
**Showing post:** 16

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**Author:** ![dpb](https://avatars.discourse-cdn.com/v4/letter/d/e99b99/32.png) [@dpb](https://meta.discourse.org/u/dpb)\
**Post date:** [March 10, 2022, 1:37am UTC](https://meta.discourse.org/t/when-trying-to-upgrade-error-running-ember-build/220532/16 "2022-03-10T01:37:08Z")

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Okay, that hinted in the right direction.

Indeed, the docker image in the launcher script was too old. We did not mess with the script though, and it was up to date with `origin/master`.

What we missed was that **the main branch of the discourse repository is has been renamed to “`main`” (formerly “`master`”)**.

After pulling from the `main` branch, the launcher worked with our original configuration, all plugins and without the `EMBER_CLI_PROD_ASSETS` workaround.

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_[View the full topic](https://meta.discourse.org/t/when-trying-to-upgrade-error-running-ember-build/220532)._