# Rebuild fails from theme error, site won't start

**URL:** <https://meta.discourse.org/t/rebuild-fails-from-theme-error-site-wont-start/108713>\
**Category:** Support\
**Created:** [February 8, 2019, 8:30pm UTC](https://meta.discourse.org/t/rebuild-fails-from-theme-error-site-wont-start/108713 "2019-02-08T20:30:55Z")\
**Posts on this page:** 1\
**Showing post:** 3

<div class="post-metadata">

**Author:** ![david](https://sea3.discourse-cdn.com/meta/user_avatar/meta.discourse.org/david/32/157490_2.png) [@david](https://meta.discourse.org/u/david)\
**Post date:** [February 8, 2019, 8:55pm UTC](https://meta.discourse.org/t/rebuild-fails-from-theme-error-site-wont-start/108713/3 "2019-02-08T20:55:46Z")

</div>

Can you try running

```plaintext
./launcher start app

```

That should bring the site back online (on the old version). Once it’s back up, please can you run

```plaintext
./launcher enter app
rails c

SiteSetting.default_theme_id

```

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