# Issue with app.yml file update
**URL:** https://meta.discourse.org/t/issue-with-app-yml-file-update/177804
**Category:** Support
**Created:** [January 30, 2021, 9:36pm UTC](https://meta.discourse.org/t/issue-with-app-yml-file-update/177804 "2021-01-30T21:36:59Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@Idan](https://meta.discourse.org/u/Idan)
#### Post date: [January 30, 2021, 9:36pm UTC](https://meta.discourse.org/t/issue-with-app-yml-file-update/177804/1 "2021-01-30T21:36:59Z")
I get an error after running `./launcher rebuild app`:
```
Did not find expected key while parsing block mapping at line 10 column 1 -e LANG-en_US.UTF8.
YAML syntax error
```
I add this to the app.yml file after “after\_code:” :
```
after_web_config:
- replace:
filename: /etc/nginx/nginx.conf
from: /sendfile.+on;/
to: |
server_names_hash_bucket_size 64;
sendfile on;
- file:
path: /etc/nginx/conf.d/discourse_redirect_1.conf
contents: |
server {
listen 80;
server_name old-domain.com;
return 301 $scheme://new-domain.com$request_uri;
}
after_ssl:
- replace:
filename: "/etc/runit/1.d/letsencrypt"
from: /--keylength/
to: "-d old-domain.com -d new-domain.com --keylength"
```
The goal to redirect 301 old domain to new domain and with LetsEncrypt continue renewing for the old domain. The .yml file edited is on the “old domain” server.
“[old-domain.com](http://old-domain.com)” and “[new-domain.com](http://new-domain.com)” are placeholders not the real web address.
as suggested [here](https://meta.discourse.org/t/redirect-single-multiple-domain-s-to-your-discourse-instance/18492) and [here](https://meta.discourse.org/t/setting-up-let-s-encrypt-with-multiple-domains/56685).
---
### Author:  [@pfaffman](https://meta.discourse.org/u/pfaffman)
#### Post date: [January 30, 2021, 10:03pm UTC](https://meta.discourse.org/t/issue-with-app-yml-file-update/177804/2 "2021-01-30T22:03:33Z")
Yes. It’s a yaml error. It could be most anywhere in the file. There are various yaml checkers on the internet. One solution is to paste the whole file into one of those.
---
### Author:  [@system](https://meta.discourse.org/u/system)
#### Post date: [March 1, 2021, 10:04pm UTC](https://meta.discourse.org/t/issue-with-app-yml-file-update/177804/3 "2021-03-01T22:04:32Z")
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