# Rake error during update (not fatal) (again)
**URL:** https://meta.discourse.org/t/rake-error-during-update-not-fatal-again/149142
**Category:** Self-hosting
**Created:** [April 24, 2020, 1:05pm UTC](https://meta.discourse.org/t/rake-error-during-update-not-fatal-again/149142 "2020-04-24T13:05:05Z")
**Posts on this page:** 1
**Page:** 1
### Author:  [@Ed\_S](https://meta.discourse.org/u/Ed_S)
#### Post date: [April 24, 2020, 1:05pm UTC](https://meta.discourse.org/t/rake-error-during-update-not-fatal-again/149142/1 "2020-04-24T13:05:06Z")
Again, for information, and looking similar to an observation made previously, 5 months ago, which seemed to be explained as a transient situation:
[Rake error during update (not fatal)](https://meta.discourse.org/t/rake-error-during-update-not-fatal/136823)
During docker upgrade:
```
Waiting for Unicorn to reload.......................
$ bundle exec rake assets:flush_sw
rake aborted!
Don't know how to build task 'assets:flush_sw' (See the list of available tasks with `rake --tasks`)
Did you mean? assets:clean
/var/www/discourse/vendor/bundle/ruby/2.6.0/gems/rake-13.0.1/exe/rake:27:in `'
/usr/local/bin/bundle:23:in `load'
/usr/local/bin/bundle:23:in `'
(See full trace by running task with --trace)
WARNING: Unable to flush service worker file
Running post deploy migrations
```
and during discourse upgrade:
```
Waiting for Unicorn to reload..........................
$ bundle exec rake assets:flush_sw
rake aborted!
Don't know how to build task 'assets:flush_sw' (See the list of available tasks with `rake --tasks`)
Did you mean? assets:clean
/var/www/discourse/vendor/bundle/ruby/2.6.0/gems/rake-13.0.1/exe/rake:27:in `'
/usr/local/bin/bundle:23:in `load'
/usr/local/bin/bundle:23:in `'
(See full trace by running task with --trace)
WARNING: Unable to flush service worker file
Running post deploy migrations
```