# Error executing command "./launcher rebuild app"

**URL:** https://meta.discourse.org/t/error-executing-command-launcher-rebuild-app/199017
**Category:** Self-hosting
**Created:** [August 3, 2021, 1:46pm UTC](https://meta.discourse.org/t/error-executing-command-launcher-rebuild-app/199017 "2021-08-03T13:46:30Z")
**Posts on this page:** 7
**Page:** 1

<div class="post-metadata">

### Author: ![Rhod](https://sea3.discourse-cdn.com/meta/user_avatar/meta.discourse.org/rhod/32/507923_2.png) [@Rhod](https://meta.discourse.org/u/Rhod)
#### Post date: [August 3, 2021, 1:46pm UTC](https://meta.discourse.org/t/error-executing-command-launcher-rebuild-app/199017/1 "2021-08-03T13:46:30Z")

</div>

Hello.  
The command “./launcher rebuild app” does not work for me.  
Discourse installed in Digital Ocean  
Ubuntu 20.04.2  
After SSHing into my server I found that I needed an update so I ran “apt-get update” and “apt-get upgrade”.  
Then I tried to install the “Discourse Solved” plugin, ran “./launcher rebuild app” and it showed me the following:

> **./launcher rebuild app**
>
> ```plaintext
> Ensuring launcher is up to date
> Fetching origin
> Launcher is up-to-date
> Stopping old container
> + /usr/bin/docker stop -t 60 app
> app
> ./launcher: line 289: warning: command substitution: ignored null byte in input
> cd /pups && git pull && git checkout v1.0.3 && /pups/bin/pups --stdin
> From https://github.com/discourse/pups
> 17f04ec..e0ff889 master -> origin/master
> * [new tag] v1.1.1 -> v1.1.1
> * [new tag] v1.1.0 -> v1.1.0
> Updating 17f04ec..e0ff889
> Fast-forward
> .github/workflows/ci.yml | 29 ++++++
> .github/workflows/lint.yml | 27 +++++
> .rubocop.yml | 3 +
> Gemfile | 2 +
> Guardfile | 4 +-
> README.md | 21 ++++
> Rakefile | 14 +--
> bin/pups | 8 +-
> lib/pups.rb | 32 ++++--
> lib/pups/cli.rb | 92 ++++++++++-------
> lib/pups/command.rb | 25 +++--
> lib/pups/config.rb | 240 +++++++++++++++++++++++--------------------
> lib/pups/docker.rb | 69 +++++++++++++
> lib/pups/exec_command.rb | 182 ++++++++++++++++----------------
> lib/pups/file_command.rb | 60 +++++------
> lib/pups/merge_command.rb | 94 ++++++++---------
> lib/pups/replace_command.rb | 70 +++++++------
> lib/pups/runit.rb | 47 +++++----
> lib/pups/version.rb | 4 +-
> pups.gemspec | 37 ++++---
> test/cli_test.rb | 102 +++++++++++++++---
> test/config_test.rb | 215 ++++++++++++++++++++++++++++----------
> test/docker_test.rb | 157 ++++++++++++++++++++++++++++
> test/exec_command_test.rb | 62 ++++++-----
> test/file_command_test.rb | 17 ++-
> test/merge_command_test.rb | 64 ++++++------
> test/replace_command_test.rb | 86 ++++++++--------
> test/test_helper.rb | 2 +
> 28 files changed, 1158 insertions(+), 607 deletions(-)
> create mode 100644 .github/workflows/ci.yml
> create mode 100644 .github/workflows/lint.yml
> create mode 100644 .rubocop.yml
> create mode 100644 lib/pups/docker.rb
> create mode 100644 test/docker_test.rb
> Note: checking out 'v1.0.3'.
> 
> You are in 'detached HEAD' state. You can look around, make experimental
> changes and commit them, and you can discard any commits you make in this
> state without impacting any branches by performing another checkout.
> 
> If you want to create a new branch to retain commits you create, you may
> do so (now or later) by using -b with the checkout command again. Example:
> 
> git checkout -b <new-branch-name>
> 
> HEAD is now at d1db030 cut a new version
> I, [2021-08-03T13:36:03.894819 #1] INFO -- : Loading --stdin
> /pups/lib/pups/cli.rb:15:in `split': invalid byte sequence in UTF-8 (ArgumentError)
> from /pups/lib/pups/cli.rb:15:in `run'
> from /pups/bin/pups:8:in `<main>'
> 8a2fdd1ae3783177d5d5a04ac692afbf3c3e445398484e6f1845171f763ceb20
> **FAILED TO BOOTSTRAP** please scroll up and look for earlier error messages, there may be more than one.
> ./discourse-doctor may help diagnose the problem.
> 
> ```

Then I ran the command “./discourse-doctor” and it gave me the following:

> **./discourse-doctor**
>
> ```plaintext
> DISCOURSE DOCTOR Tue Aug 3 13:20:43 UTC 2021
> OS: Linux foro 5.4.0-80-generic #90-Ubuntu SMP Fri Jul 9 22:49:44 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
> 
> Found containers/app.yml
> 
> ==================== YML SETTINGS ====================
> DISCOURSE_HOSTNAME=
> SMTP_ADDRESS=
> DEVELOPER_EMAILS=REDACTED 
> SMTP_PASSWORD=REDACTED 
> SMTP_PORT=
> SMTP_USER_NAME=
> LETSENCRYPT_ACCOUNT_EMAIL=REDACTED 
> 
> ==================== DOCKER INFO ====================
> DOCKER VERSION: Docker version 20.10.7, build f0df350
> 
> DOCKER PROCESSES (docker ps -a)
> 
> CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
> 66eba750efb9 local_discourse/app "/sbin/boot" 4 days ago Exited (5) 3 hours ago app
> 
> ==================== SERIOUS PROBLEM!!!! ====================
> app not running!
> Attempting to rebuild
> ==================== REBUILD LOG ====================
> Ensuring launcher is up to date
> Fetching origin
> Launcher is up-to-date
> Stopping old container
> + /usr/bin/docker stop -t 60 app
> app
> ./launcher: line 289: warning: command substitution: ignored null byte in input
> cd /pups && git pull && git checkout v1.0.3 && /pups/bin/pups --stdin
> From https://github.com/discourse/pups
> 17f04ec..e0ff889 master -> origin/master
> * [new tag] v1.1.1 -> v1.1.1
> * [new tag] v1.1.0 -> v1.1.0
> Updating 17f04ec..e0ff889
> Fast-forward
> .github/workflows/ci.yml | 29 ++++++
> .github/workflows/lint.yml | 27 +++++
> .rubocop.yml | 3 +
> Gemfile | 2 +
> Guardfile | 4 +-
> README.md | 21 ++++
> Rakefile | 14 +--
> bin/pups | 8 +-
> lib/pups.rb | 32 ++++--
> lib/pups/cli.rb | 92 ++++++++++-------
> lib/pups/command.rb | 25 +++--
> lib/pups/config.rb | 240 +++++++++++++++++++++++--------------------
> lib/pups/docker.rb | 69 +++++++++++++
> lib/pups/exec_command.rb | 182 ++++++++++++++++----------------
> lib/pups/file_command.rb | 60 +++++------
> lib/pups/merge_command.rb | 94 ++++++++---------
> lib/pups/replace_command.rb | 70 +++++++------
> lib/pups/runit.rb | 47 +++++----
> lib/pups/version.rb | 4 +-
> pups.gemspec | 37 ++++---
> test/cli_test.rb | 102 +++++++++++++++---
> test/config_test.rb | 215 ++++++++++++++++++++++++++++----------
> test/docker_test.rb | 157 ++++++++++++++++++++++++++++
> test/exec_command_test.rb | 62 ++++++-----
> test/file_command_test.rb | 17 ++-
> test/merge_command_test.rb | 64 ++++++------
> test/replace_command_test.rb | 86 ++++++++--------
> test/test_helper.rb | 2 +
> 28 files changed, 1158 insertions(+), 607 deletions(-)
> create mode 100644 .github/workflows/ci.yml
> create mode 100644 .github/workflows/lint.yml
> create mode 100644 .rubocop.yml
> create mode 100644 lib/pups/docker.rb
> create mode 100644 test/docker_test.rb
> Note: checking out 'v1.0.3'.
> 
> You are in 'detached HEAD' state. You can look around, make experimental
> changes and commit them, and you can discard any commits you make in this
> state without impacting any branches by performing another checkout.
> 
> If you want to create a new branch to retain commits you create, you may
> do so (now or later) by using -b with the checkout command again. Example:
> 
> git checkout -b <new-branch-name>
> 
> HEAD is now at d1db030 cut a new version
> I, [2021-08-03T13:20:51.459842 #1] INFO -- : Loading --stdin
> /pups/lib/pups/cli.rb:15:in `split': invalid byte sequence in UTF-8 (ArgumentError)
> from /pups/lib/pups/cli.rb:15:in `run'
> from /pups/bin/pups:8:in `<main>'
> 8a2381ff0429f3448f46daa6c1b238dde16efbaa75c7e3b9dc1b9cfb8090a069
> **FAILED TO BOOTSTRAP** please scroll up and look for earlier error messages, there may be more than one.
> ./discourse-doctor may help diagnose the problem.
> ==================== END REBUILD LOG ====================
> Failed to rebuild app.
> 
> Checking your domain name . . .
> 
> Connection to 443 succeeded.
> You should probably remove any non-standard plugins and rebuild.
> Attempting to restart existing container. . . 
> 
> starting up existing container
> + /usr/bin/docker start app
> app
> Restarted the container.
> 
> ==================== PLUGINS ====================
> 
> No non-official plugins detected.
> 
> See https://github.com/discourse/discourse/blob/master/lib/plugin/metadata.rb for the official list.
> 
> ========================================
> Discourse version at : NOT FOUND
> Discourse version at localhost: NOT FOUND
> 
> ==================== MEMORY INFORMATION ====================
> OS: Linux
> RAM (MB): 2084
> 
> total used free shared buff/cache available
> Mem: 1987 266 869 17 852 1542
> Swap: 2047 0 2047
> 
> ==================== DISK SPACE CHECK ====================
> ---------- OS Disk Space ----------
> Filesystem Size Used Avail Use% Mounted on
> /dev/vda1 49G 8.1G 41G 17% /
> 
> ==================== DISK INFORMATION ====================
> Disk /dev/loop0: 55.45 MiB, 58134528 bytes, 113544 sectors
> Units: sectors of 1 * 512 = 512 bytes
> Sector size (logical/physical): 512 bytes / 512 bytes
> I/O size (minimum/optimal): 512 bytes / 512 bytes
> 
> Disk /dev/loop1: 67.58 MiB, 70848512 bytes, 138376 sectors
> Units: sectors of 1 * 512 = 512 bytes
> Sector size (logical/physical): 512 bytes / 512 bytes
> I/O size (minimum/optimal): 512 bytes / 512 bytes
> 
> Disk /dev/loop2: 70.32 MiB, 73728000 bytes, 144000 sectors
> Units: sectors of 1 * 512 = 512 bytes
> Sector size (logical/physical): 512 bytes / 512 bytes
> I/O size (minimum/optimal): 512 bytes / 512 bytes
> 
> Disk /dev/loop3: 55.43 MiB, 58114048 bytes, 113504 sectors
> Units: sectors of 1 * 512 = 512 bytes
> Sector size (logical/physical): 512 bytes / 512 bytes
> I/O size (minimum/optimal): 512 bytes / 512 bytes
> 
> Disk /dev/loop4: 32.3 MiB, 33865728 bytes, 66144 sectors
> Units: sectors of 1 * 512 = 512 bytes
> Sector size (logical/physical): 512 bytes / 512 bytes
> I/O size (minimum/optimal): 512 bytes / 512 bytes
> 
> Disk /dev/loop5: 32.29 MiB, 33853440 bytes, 66120 sectors
> Units: sectors of 1 * 512 = 512 bytes
> Sector size (logical/physical): 512 bytes / 512 bytes
> I/O size (minimum/optimal): 512 bytes / 512 bytes
> 
> Disk /dev/vda: 50 GiB, 53687091200 bytes, 104857600 sectors
> Units: sectors of 1 * 512 = 512 bytes
> Sector size (logical/physical): 512 bytes / 512 bytes
> I/O size (minimum/optimal): 512 bytes / 512 bytes
> Disklabel type: gpt
> Disk identifier: BEF50A53-93AD-46BC-A437-0668221D1666
> 
> Device Start End Sectors Size Type
> /dev/vda1 227328 104857566 104630239 49.9G Linux filesystem
> /dev/vda14 2048 10239 8192 4M BIOS boot
> /dev/vda15 10240 227327 217088 106M Microsoft basic data
> 
> Partition table entries are not in disk order.
> 
> ==================== END DISK INFORMATION ====================
> 
> ==================== MAIL TEST ====================
> For a robust test, get an address from http://www.mail-tester.com/
> Sending mail to REDACTED . . 
> Testing sending to test-9jlant6d8@srv1.mail-tester.com using smtp.sendgrid.net:587, username:apikey with plain auth.
> SMTP server connection successful.
> Sending to test-9jlant6d8@srv1.mail-tester.com. . . 
> Mail accepted by SMTP server.
> Message-ID: 4e0d23cb-7ae1-4158-b365-9e5da624e2e8@fHIDDEN
> 
> If you do not receive the message, check your SPAM folder
> or test again using a service like http://www.mail-tester.com/.
> 
> If the message is not delivered it is not a problem with Discourse.
> Check the SMTP server logs for the above Message ID to see why it
> failed to deliver the message.
> 
> ==================== DONE! ====================
> Publicly available log not generated.
> 
> You can examine the output of this script with 
> LESS=-Ri less /tmp/discourse-debug.txt
> 
> BUT FIRST, make sure that you know the first three commands below!!!
> 
> Commands to know when viewing the file with the above command (called 'less'): 
> q -- quit
> /error<ENTER> -- search for the word 'error'
> n -- search for the next occurrence
> g -- go to the beginning of the file
> f -- go forward a page
> b -- go back a page
> G -- go to the end of the file
> 
> ```

My file “app.yml” I have it like this:

> **.app.yml**
>
> ```plaintext
> ## this is the all-in-one, standalone Discourse Docker container template
> ##
> ## After making changes to this file, you MUST rebuild
> ## /var/discourse/launcher rebuild app
> ##
> ## BE *VERY* CAREFUL WHEN EDITING!
> ## YAML FILES ARE SUPER SUPER SENSITIVE TO MISTAKES IN WHITESPACE OR ALIGNMENT!
> ## visit http://www.yamllint.com/ to validate this file as needed
> 
> templates:
> - "templates/postgres.template.yml"
> - "templates/redis.template.yml"
> - "templates/web.template.yml"
> - "templates/web.ratelimited.template.yml"
> ## Uncomment these two lines if you wish to add Lets Encrypt (https)
> - "templates/web.ssl.template.yml"
> - "templates/web.letsencrypt.ssl.template.yml"
> 
> ## which TCP/IP ports should this container expose?
> ## If you want Discourse to share a port with another webserver like Apache or nginx,
> ## see https://meta.discourse.org/t/17247 for details
> expose:
> - "80:80" # http
> - "443:443" # https
> 
> params:
> db_default_text_search_config: "pg_catalog.english"
> 
> ## Set db_shared_buffers to a max of 25% of the total memory.
> ## will be set automatically by bootstrap based on detected RAM, or you can override
> db_shared_buffers: "256MB"
> 
> ## can improve sorting performance, but adds memory usage per-connection
> #db_work_mem: "40MB"
> 
> ## Which Git revision should this container use? (default: tests-passed)
> #version: tests-passed
> 
> env:
> LC_ALL: en_US.UTF-8
> LANG: en_US.UTF-8
> LANGUAGE: en_US.UTF-8
> # DISCOURSE_DEFAULT_LOCALE: en
> 
> ## How many concurrent web requests are supported? Depends on memory and CPU cores.
> ## will be set automatically by bootstrap based on detected CPUs, or you can override
> UNICORN_WORKERS: 4
> 
> ## TODO: The domain name this Discourse instance will respond to
> ## Required. Discourse will not work with a bare IP number.
> DISCOURSE_HOSTNAME: HIDDEN
> 
> ## Uncomment if you want the container to be started with the same
> ## hostname (-h option) as specified above (default "$hostname-$config")
> #DOCKER_USE_HOSTNAME: true
> 
> ## TODO: List of comma delimited emails that will be made admin and developer
> ## on initial signup example 'user1@example.com,user2@example.com'
> DISCOURSE_DEVELOPER_EMAILS: 'HIDDEN'
> 
> ## TODO: The SMTP mail server used to validate new accounts and send notifications
> # SMTP ADDRESS, username, and password are required
> # WARNING the char '#' in SMTP password can cause problems!
> DISCOURSE_SMTP_ADDRESS: HIDDEN
> DISCOURSE_SMTP_PORT: HIDDEN
> DISCOURSE_SMTP_USER_NAME: HIDDEN
> DISCOURSE_SMTP_PASSWORD: "HIDDEN"
> #DISCOURSE_SMTP_ENABLE_START_TLS: true # (optional, default true)
> DISCOURSE_SMTP_DOMAIN: HIDDEN
> DISCOURSE_NOTIFICATION_EMAIL: HIDDEN
> 
> ## If you added the Lets Encrypt template, uncomment below to get a free SSL certificate
> LETSENCRYPT_ACCOUNT_EMAIL: HIDDEN
> 
> ## The http or https CDN address for this Discourse instance (configured to pull)
> ## see https://meta.discourse.org/t/14857 for details
> #DISCOURSE_CDN_URL: https://discourse-cdn.example.com
>   
> ## The maxmind geolocation IP address key for IP address lookup
> ## see https://meta.discourse.org/t/-/137387/23 for details
> #DISCOURSE_MAXMIND_LICENSE_KEY: 1234567890123456
> 
> ## The Docker container is stateless; all data is stored in /shared
> volumes:
> - volume:
> host: /var/discourse/shared/standalone
> guest: /shared
> - volume:
> host: /var/discourse/shared/standalone/log/var-log
> guest: /var/log
> 
> ## Plugins go here
> ## see https://meta.discourse.org/t/19157 for details
> hooks:
> after_code:
> - exec:
> cd: $home/plugins
> cmd:
> - git clone https://github.com/discourse/docker_manager.git
> - git clone https://github.com/discourse/discourse-voting          
> 
> ## Any custom commands to run after building
> run:
> - exec: echo "Beginning of custom commands"
> ## If you want to set the 'From' email address for your first registration, uncomment and change:
> ## After getting the first signup email, re-comment the line. It only needs to run once.
> #- exec: rails r "SiteSetting.notification_email='info@unconfigured.discourse.org'"
> - exec: echo "End of custom commands"
> 
> ```
> 
> I appreciate your help in advance.

---

<div class="post-metadata">

### Author: ![Falco](https://sea3.discourse-cdn.com/meta/user_avatar/meta.discourse.org/falco/32/179432_2.png) [@Falco](https://meta.discourse.org/u/Falco)
#### Post date: [August 3, 2021, 1:58pm UTC](https://meta.discourse.org/t/error-executing-command-launcher-rebuild-app/199017/2 "2021-08-03T13:58:07Z")

</div>

Your app.yml contains an invalid character. It’s probably one that you elided when posting here.

---

<div class="post-metadata">

### Author: ![Rhod](https://sea3.discourse-cdn.com/meta/user_avatar/meta.discourse.org/rhod/32/507923_2.png) [@Rhod](https://meta.discourse.org/u/Rhod)
#### Post date: [August 3, 2021, 2:37pm UTC](https://meta.discourse.org/t/error-executing-command-launcher-rebuild-app/199017/3 "2021-08-03T14:37:15Z")

</div>

Where? tell me please

---

<div class="post-metadata">

### Author: ![Falco](https://sea3.discourse-cdn.com/meta/user_avatar/meta.discourse.org/falco/32/179432_2.png) [@Falco](https://meta.discourse.org/u/Falco)
#### Post date: [August 3, 2021, 2:38pm UTC](https://meta.discourse.org/t/error-executing-command-launcher-rebuild-app/199017/4 "2021-08-03T14:38:13Z")

</div>

Try validating it with a tool. [http://www.yamllint.com/](http://www.yamllint.com/) should work.

---

<div class="post-metadata">

### Author: ![Rhod](https://sea3.discourse-cdn.com/meta/user_avatar/meta.discourse.org/rhod/32/507923_2.png) [@Rhod](https://meta.discourse.org/u/Rhod)
#### Post date: [August 3, 2021, 2:39pm UTC](https://meta.discourse.org/t/error-executing-command-launcher-rebuild-app/199017/5 "2021-08-03T14:39:53Z")

</div>

Yes, it is valid, it does not mark an error.

---

<div class="post-metadata">

### Author: ![Rhod](https://sea3.discourse-cdn.com/meta/user_avatar/meta.discourse.org/rhod/32/507923_2.png) [@Rhod](https://meta.discourse.org/u/Rhod)
#### Post date: [August 3, 2021, 5:38pm UTC](https://meta.discourse.org/t/error-executing-command-launcher-rebuild-app/199017/6 "2021-08-03T17:38:24Z")

</div>

I already solved it, apparently the file was corrupt, the only thing I did was delete it and create a new one by pasting the data using the “sublimetext3” editor.  
I forgot to mention that the error occurred after wanting to edit the “app.yaml” file through an editor in android “Admin Hands: SSH / FTP / SFTP / TLN”, apparently when saving the editor it saved the file in an erroneous and corrupted, but the funny thing is that I could edit it without problems and it passed the site test: [http://www.yamllint.com/](http://www.yamllint.com/).  
Anyway I leave this message for possible future references.

---

<div class="post-metadata">

### Author: ![system](https://sea3.discourse-cdn.com/meta/user_avatar/meta.discourse.org/system/32/443519_2.png) [@system](https://meta.discourse.org/u/system)
#### Post date: [September 2, 2021, 5:38pm UTC](https://meta.discourse.org/t/error-executing-command-launcher-rebuild-app/199017/7 "2021-09-02T17:38:37Z")

</div>

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