# Upgrade with discourse-tagging plugin failed, website down

**URL:** <https://meta.discourse.org/t/upgrade-with-discourse-tagging-plugin-failed-website-down/31746>\
**Category:** Product Support\
**Created:** [4 Agosto 2015, 2:56pm UTC](https://meta.discourse.org/t/upgrade-with-discourse-tagging-plugin-failed-website-down/31746 "2015-08-04T14:56:04Z")\
**Posts on this page:** 1\
**Showing post:** 1

<div class="post-metadata">

**Author:** ![uwe\_keim](https://sea3.discourse-cdn.com/meta/user_avatar/meta.discourse.org/uwe_keim/32/326762_2.png) [@uwe\_keim](https://meta.discourse.org/u/uwe_keim)\
**Post date:** [4 Agosto 2015, 2:56pm UTC](https://meta.discourse.org/t/upgrade-with-discourse-tagging-plugin-failed-website-down/31746/1 "2015-08-04T14:56:04Z")

</div>

Tried to do an upgrade through the web UI, it failed.

I then did the usual

```
cd /var/discourse
git pull
./launcher rebuild app

```

but it also failed ([discourse-upgrade-failed.txt](https://global.discourse-cdn.com/meta/original/3X/8/2/827f4120ccc7e9eb3b47def16b41719546fe4515.txt)):

> \*\* FAILED TO BOOTSTRAP \*\* please scroll up and look for earlier error messages, there may be more than one

I’ve found this error, scrolling up.

> NoMethodError: undefined method `attributes’ for TopicListItemSerializer:Class

Now [my website](http://entwicklergate.de) is down and I’m really clueless.

**My question:**

How to approach this and bring my website back online again?

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_[View the full topic](https://meta.discourse.org/t/upgrade-with-discourse-tagging-plugin-failed-website-down/31746)._