# Focalboard plugin rejected: "Version string empty"

**URL:** <https://forum.mattermost.com/t/focalboard-plugin-rejected-version-string-empty/25896>\
**Category:** Unanswered\
**Created:** [May 20, 2026, 9:05pm UTC](https://forum.mattermost.com/t/focalboard-plugin-rejected-version-string-empty/25896 "2026-05-20T21:05:28Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![RRCJF](https://avatars.discourse-cdn.com/v4/letter/r/a88e57/32.png) [@RRCJF](https://forum.mattermost.com/u/RRCJF)\
**Post date:** [May 20, 2026, 9:05pm UTC](https://forum.mattermost.com/t/focalboard-plugin-rejected-version-string-empty/25896/1 "2026-05-20T21:05:28Z")

</div>

- Do anyone knows the reason for this error on mattermost.log. I saw it testing, after the migration to postgresql.

```auto
... "level":"error","msg":"Should not persist transitionally prepackged plugin: invalid prepackaged version","caller":"app/plugin.go:1151","plugin_id":"focalboard","prepackaged_version":"","error":"Version string empty"

```

- I’m using Mattermost 10.11.17. on Ubuntu.
- If someone has a solution please let me know.

Thanks

---

<div class="post-metadata">

**Author:** ![RRCJF](https://avatars.discourse-cdn.com/v4/letter/r/a88e57/32.png) [@RRCJF](https://forum.mattermost.com/u/RRCJF)\
**Post date:** [May 27, 2026, 4:17pm UTC](https://forum.mattermost.com/t/focalboard-plugin-rejected-version-string-empty/25896/2 "2026-05-27T16:17:35Z")

</div>

Maybe writing in the right troubleshooting format is more easy to understand.

- Summary  
Focalboard plugin doesn’t show version or is in wrong format.

- Steps to reproduce  
Mattermost Server: 10.11.17  
Postgresql: 16.13-0ubuntu0.24.04.1  
OS: Ubuntu 24.04.4

1. Migrate from Mysql to Postgresql with the needed databases setups for compatibility.
2. Have the Focalboard plugin installed.
3. Observe the error reported on mattermost.log .

- Expected behavior  
The plugin should have a version in right format.

- Observed behavior  
From mattermost.log:

```auto
... "level":"error","msg":"Should not persist transitionally prepackged plugin: invalid prepackaged version","caller":"app/plugin.go:1151","plugin_id":"focalboard","prepackaged_version":"","error":"Version string empty"

```