# Failed to handle exception in exception app middleware : PG::UndefinedTable: ERROR: relation "themes" does not exist

**URL:** <https://meta.discourse.org/t/failed-to-handle-exception-in-exception-app-middleware-pg-error-relation-themes-does-not-exist/108594>\
**Category:** Support\
**Created:** [February 7, 2019, 12:32pm UTC](https://meta.discourse.org/t/failed-to-handle-exception-in-exception-app-middleware-pg-error-relation-themes-does-not-exist/108594 "2019-02-07T12:32:12Z")\
**Posts on this page:** 1\
**Showing post:** 2

<div class="post-metadata">

**Author:** ![sam](https://sea3.discourse-cdn.com/meta/user_avatar/meta.discourse.org/sam/32/102149_2.png) [@sam](https://meta.discourse.org/u/sam)\
**Post date:** [February 7, 2019, 9:47pm UTC](https://meta.discourse.org/t/failed-to-handle-exception-in-exception-app-middleware-pg-error-relation-themes-does-not-exist/108594/2 "2019-02-07T21:47:52Z")

</div>

Can you try?

```plaintext
cd /var/discourse
./launcher rebuild app

```

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_[View the full topic](https://meta.discourse.org/t/failed-to-handle-exception-in-exception-app-middleware-pg-error-relation-themes-does-not-exist/108594)._