# Can not build Kepler Video Sample App

**URL:** <https://community.amazondeveloper.com/t/can-not-build-kepler-video-sample-app/28074>\
**Category:** Bug Reports\
**Created:** [April 9, 2026, 3:34am UTC](https://community.amazondeveloper.com/t/can-not-build-kepler-video-sample-app/28074 "2026-04-09T03:34:30Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![NamTran](https://avatars.discourse-cdn.com/v4/letter/n/5f9b8f/32.png) [@NamTran](https://community.amazondeveloper.com/u/NamTran)\
**Post date:** [April 9, 2026, 3:34am UTC](https://community.amazondeveloper.com/t/can-not-build-kepler-video-sample-app/28074/1 "2026-04-09T03:34:30Z")

</div>

# ⚠ Before you continue

* * *

_Before submitting a bug report, please review our troubleshooting documentation at_ [Troubleshoot Issues | Vega Troubleshooting](https://developer.amazon.com/docs/vega/0.21/troubleshoot-overview.html)

_If you still want to file a bug report, please make sure to fill in all the details below and provide the necessary information._

**NOTE: PLEASE ONLY REPORT A SINGLE BUG USING THIS TEMPLATE.**  
_If you’re experiencing multiple issues, please file a separate report for each._

* * *

# 👉 Bug Description

* * *

## 1. Summary

The build process fails during the `build:release` stage because the Conan package manager cannot resolve `vegapackagingtool/1.1.3`. This is due to repeated **503 Service Unavailable** errors from the Artifactory server.

**App Name** :@amzn/Keplervideoapp  
**App Link on Amazon Appstore** (found through Developer@amznConsole → Actions column in App List → View on [Amazon.com](http://Amazon.com)):

**Bug Severity**  
Select one that applies

- Impacts operation of app
- Blocks current development
- Improvement suggestion
- Issue with documentation (If selected, please share the doc link and describe the issue)
- Other

## 2. Steps to Reproduce

1. Run `npm install` to ensure dependencies are present.

2. Run `npm run build:app` or `npm run build:release`.

3. The process starts Metro bundler, completes JS bundling, but fails when invoking `kepler path hermes`.

## 3. Observed Behavior

_Explain what actually happened, noting any discrepancies or malfunctions._

```auto
The build fails with the error: ERROR: Package 'vegapackagingtool/1.1.3' not resolved: HTTPSConnectionPool(host='k-artifactory-external.labcollab.net', port=443): Max retries exceeded (Caused by ResponseError('too many 503 error responses')).

```

## 4. Expected Behavior

_Describe what you expected the SDK to do under normal operation._

```auto
The SDK should be able to connect to k-artifactory-external.labcollab.net, resolve the dependency graph via Conan, and complete the build process.

```

### 4.a Possible Root Cause & Temporary Workaround

_Fill out anything you have tried. If you don’t know, N/A is acceptable_

```auto
Root Cause: The remote Artifactory server (labcollab.net) is either down, under maintenance, or overloaded (HTTP 503).

Workaround: Tried clearing Conan cache (rm -rf ~/.kepler/conan) and re-logging via kepler login, but the issue persists.gửi 

```

## 5. Logs or crash report

_**`(Please`**_

[ERROR logs.txt](https://community.amazondeveloper.com/uploads/short-url/q7DcaNpxya49ixabs7orJS020ev.txt) (17.4 KB)

_**`make sure to provide relevant logs as attachment)`**_

For crash issues, please refer this guide for faster troubleshooting: [Detect Where the App Crash Originates | Design and Develop Vega Apps](https://developer.amazon.com/docs/vega/0.21/detect-crash.html)

- [App/Device Logs](https://developer.amazon.com/docs/vega/0.21/logs.html)

- [Crash Logs](https://developer.amazon.com/docs/vega/0.21/loggingctl.html)

- [Crash Report](https://developer.amazon.com/docs/vega/0.21/crash-report.html)

- For issues with Vega Studio Extension, please share log files from below folders:  
For v0.22+:

## 6. Environment

_Please fill out the fields related to your bug below:_

- **SDK Version:** Run **SDK Version:** Kepler SDK 0.10.4

- **App State:** `[Foreground/Background]`

- **OS Information:** macOS (Darwin arm64)

## 7. Example Code Snippet / Screenshots / Screengrabs

_Include any relevant code or component setup in React Native that can help reproduce the bug._

```auto
import { ExampleComponent } from 'custom-sdk';

<ExampleComponent config={{ key: 'value' }} />

```

* * *

## 👉 Playback Issues

* * *

_If this is a playback issue, please provide your content URL, any pre-conditions (like geo-location), and let us know if it’s x86 or arm7._

```auto

<!-- Describe your playback issue if applicable -->

```

Please share the following details in addition:\_

- **Player SDK:** `[Bitmovin, Shaka, ...]`
- **Player SDK Version:** `[e.g. 1.23]`
  - **Audio Codecs:** `[AAC, ...]`
  - **Video Codecs:** `[h.264, mp4]`
  - **Manifest Types:** `[m3u8, dash, etc ..]`

**Q: If applicable, please provide your media/content url**  
_If this is created dynamically, tokenized, etc please provide a way for us to access it_

```auto
[N/A or Content / Media Url for testing]

```

**Q: Are there any special headers required to reproduce the issue you are facing?**

```auto
[N/A or Insert Headers]

```

**Additionally please provide the following if possible**  
_Provide Screenshots / Screengrabs / Logs. Please include as much information as you can that will help debug._

```auto
<!-- Answer here if applicable --> 

```

* * *

## 👉 Additional Context

* * *

**Any Additional Context you would like to provide?**  
_Add any other relevant information, such as recent updates to the SDK, dependencies, or device OS that may affect the bug._

```auto
<!-- Answer here if applicable --> 

```

---

<div class="post-metadata">

**Author:** ![Ivy](https://dhm3gbtzu79o6.cloudfront.net/user_avatar/community.amazondeveloper.com/ivy/32/5637_2.png) [@Ivy](https://community.amazondeveloper.com/u/Ivy)\
**Post date:** [April 9, 2026, 8:30am UTC](https://community.amazondeveloper.com/t/can-not-build-kepler-video-sample-app/28074/3 "2026-04-09T08:30:52Z")

</div>

Hi @NamTran

Thank you for the detailed bug report.

The 503 errors from [k-artifactory-external.labcollab.net](http://k-artifactory-external.labcollab.net) indicate a server-side availability issue when resolving the vegapackagingtool/1.1.3 Conan package.

However, I want to flag that you’re using **Kepler SDK 0.10.4** , which is significantly outdated. The current SDK version is **0.22+** , and the platform has been rebranded from Kepler to Vega. Since August 2025, Appstore app submissions require SDK v0.20 or newer.

The Artifactory infrastructure for very old SDK versions may not be actively maintained, which could explain the persistent 503 errors you’re seeing.

I reviewed the logs and confirmed the issue. A few additional observations:

- Your app directory (KeplerVideoSampleApp-Code-RN72-v0.20.8) suggests it’s designed for **SDK v0.20.8** , but your installed SDK is **v0.10.4**. This version mismatch is likely the root cause — the Conan dependency vegapackagingtool/1.1.3 may not exist for SDK 0.10.4, and the old SDK’s Artifactory endpoints may no longer be reliably served.
- Your CLI is also showing a deprecation warning: build-kepler is deprecated in favor of build-vega.
- Your React Native version (0.60.6) in the npm warnings is also very outdated.

**Recommended action:**

1. **Upgrade to the latest Vega SDK (v0.22+) (or at minimum v0.20.8 to match your app)**. This will resolve the dependency resolution issue as the current SDK uses updated and actively maintained package repositories. See the [installation guide](https://developer.amazon.com/docs/vega/0.22/install-vega-sdk.html).
2. After installing the new SDK, you’ll need to migrate your project from the old Kepler structure to Vega. Key changes include:

- CLI command changed from kepler to vega
- Package names changed from @amzn/ to @amazon-devices/
- Updated dependency versions

1. If you need to continue building with the old SDK temporarily while you plan the migration, try again later in case the 503 is a transient Artifactory outage. You can also try:

```auto
rm -rf ~/.kepler/conan
kepler login

```

Then retry the build. But this is only a temporary measure — upgrading is strongly recommended.

**Important** : Apps built with SDK versions older than 0.20 will be rejected during Appstore submission, so upgrading is necessary regardless.

Warm regards,  
Ivy

---

<div class="post-metadata">

**Author:** ![system](https://dhm3gbtzu79o6.cloudfront.net/user_avatar/community.amazondeveloper.com/system/32/5065_2.png) [@system](https://community.amazondeveloper.com/u/system)\
**Post date:** [April 23, 2026, 6:47pm UTC](https://community.amazondeveloper.com/t/can-not-build-kepler-video-sample-app/28074/5 "2026-04-23T18:47:27Z")

</div>

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