I have searched the existing issues and discussions.
I am using the latest version of Open WebUI.
Installation Method
Docker
Open WebUI Version
0.6.15
Ollama Version (if applicable)
No response
Operating System
ubuntu 24.04 (docker)
Browser (if applicable)
No response
Confirmation
I have read and followed all instructions in README.md.
I am using the latest version of both Open WebUI and Ollama.
I have included the browser console logs.
I have included the Docker container logs.
I have provided every relevant configuration, setting, and environment variable used in my setup.
I have clearly listed every relevant configuration, custom setting, environment variable, and command-line option that influences my setup (such as Docker Compose overrides, .env values, browser settings, authentication configurations, etc).
I have documented step-by-step reproduction instructions that are precise, sequential, and leave nothing to interpretation. My steps:
Start with the initial platform/version/OS and dependencies used,
Specify exact install/launch/configure commands,
List URLs visited, user input (incl. example values/emails/passwords if needed),
Describe all options and toggles enabled or changed,
Include any files or environmental changes,
Identify the expected and actual result at each stage,
Ensure any reasonably skilled user can follow and hit the same issue.
Expected Behavior
No error on docker compose up
Actual Behavior
yaml: line 13: mapping values are not allowed in this context
services:
open-webui:
image: ghcr.io/open-webui/open-webui:main
container_name: open-webui
volumes:
- ./open-webui/data:/app/backend/data
- /etc/localtime:/etc/localtime:ro
ports:
- 3000:8080
restart: always
environment:
- ENABLE_PERSISTENT_CONFIG=false
- WEBUI_BANNERS="[{\"id\": \"1\", \"type\": \"warning\", \"title\": \"Your messages are stored.\", \"content\": \"Your messages are stored and may be reviewed by human people. LLM's are prone to hallucinations, check sources.\", \"dismissible\": true, \"timestamp\": 1000}]"
I have done docker compose up
And I have this error
yaml: line 13: mapping values are not allowed in this context
Logs & Screenshots
yaml: line 13: mapping values are not allowed in this context
Additional Information
No response
Originally created by @devbysb on GitHub (Jun 26, 2025).
Original GitHub issue: https://github.com/open-webui/open-webui/issues/15322
### Check Existing Issues
- [x] I have searched the existing issues and discussions.
- [x] I am using the latest version of Open WebUI.
### Installation Method
Docker
### Open WebUI Version
0.6.15
### Ollama Version (if applicable)
_No response_
### Operating System
ubuntu 24.04 (docker)
### Browser (if applicable)
_No response_
### Confirmation
- [x] I have read and followed all instructions in `README.md`.
- [x] I am using the latest version of **both** Open WebUI and Ollama.
- [x] I have included the browser console logs.
- [x] I have included the Docker container logs.
- [x] I have **provided every relevant configuration, setting, and environment variable used in my setup.**
- [x] I have clearly **listed every relevant configuration, custom setting, environment variable, and command-line option that influences my setup** (such as Docker Compose overrides, .env values, browser settings, authentication configurations, etc).
- [x] I have documented **step-by-step reproduction instructions that are precise, sequential, and leave nothing to interpretation**. My steps:
- Start with the initial platform/version/OS and dependencies used,
- Specify exact install/launch/configure commands,
- List URLs visited, user input (incl. example values/emails/passwords if needed),
- Describe all options and toggles enabled or changed,
- Include any files or environmental changes,
- Identify the expected and actual result at each stage,
- Ensure any reasonably skilled user can follow and hit the same issue.
### Expected Behavior
No error on docker compose up
### Actual Behavior
yaml: line 13: mapping values are not allowed in this context
### Steps to Reproduce
Hi I have followed https://docs.openwebui.com/getting-started/env-configuration/#webui_banners
With this docker compose yaml file
```
services:
open-webui:
image: ghcr.io/open-webui/open-webui:main
container_name: open-webui
volumes:
- ./open-webui/data:/app/backend/data
- /etc/localtime:/etc/localtime:ro
ports:
- 3000:8080
restart: always
environment:
- ENABLE_PERSISTENT_CONFIG=false
- WEBUI_BANNERS="[{\"id\": \"1\", \"type\": \"warning\", \"title\": \"Your messages are stored.\", \"content\": \"Your messages are stored and may be reviewed by human people. LLM's are prone to hallucinations, check sources.\", \"dismissible\": true, \"timestamp\": 1000}]"
```
I have done docker compose up
And I have this error
yaml: line 13: mapping values are not allowed in this context
### Logs & Screenshots
yaml: line 13: mapping values are not allowed in this context
### Additional Information
_No response_
GiteaMirror
added the bug label 2026-05-13 04:08:57 -05:00
- WEBUI_BANNERS=[{"id":"1","type":"warning","title":"Your messages are stored.","content":"Your messages are stored and may be reviewed by human people. LLM's are prone to hallucinations, check sources.","dismissible":true,"timestamp":1000}]
The problem is, that you compose file is not a proper yaml.
<!-- gh-comment-id:3009381370 -->
@guenhter commented on GitHub (Jun 26, 2025):
Try to change it to
```yaml
- WEBUI_BANNERS=[{"id":"1","type":"warning","title":"Your messages are stored.","content":"Your messages are stored and may be reviewed by human people. LLM's are prone to hallucinations, check sources.","dismissible":true,"timestamp":1000}]
```
The problem is, that you compose file is not a proper yaml.
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Originally created by @devbysb on GitHub (Jun 26, 2025).
Original GitHub issue: https://github.com/open-webui/open-webui/issues/15322
Check Existing Issues
Installation Method
Docker
Open WebUI Version
0.6.15
Ollama Version (if applicable)
No response
Operating System
ubuntu 24.04 (docker)
Browser (if applicable)
No response
Confirmation
README.md.Expected Behavior
No error on docker compose up
Actual Behavior
yaml: line 13: mapping values are not allowed in this context
Steps to Reproduce
Hi I have followed https://docs.openwebui.com/getting-started/env-configuration/#webui_banners
With this docker compose yaml file
I have done docker compose up
And I have this error
yaml: line 13: mapping values are not allowed in this context
Logs & Screenshots
yaml: line 13: mapping values are not allowed in this context
Additional Information
No response
@guenhter commented on GitHub (Jun 26, 2025):
Can you add a properly formatted compose file please.
@devbysb commented on GitHub (Jun 26, 2025):
Sorry bad copy/paste :)
@guenhter commented on GitHub (Jun 26, 2025):
Try to change it to
The problem is, that you compose file is not a proper yaml.