# SimpleTasks requires Checklists

**URL:** <https://community.bluespice.com/t/simpletasks-requires-checklists/362>\
**Category:** Bugs\
**Created:** [January 21, 2026, 3:18pm UTC](https://community.bluespice.com/t/simpletasks-requires-checklists/362 "2026-01-21T15:18:16Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![lemrouch](https://dub1.discourse-cdn.com/flex017/user_avatar/community.bluespice.com/lemrouch/32/239_2.png) [@lemrouch](https://community.bluespice.com/u/lemrouch)\
**Post date:** [January 21, 2026, 3:18pm UTC](https://community.bluespice.com/t/simpletasks-requires-checklists/362/1 "2026-01-21T15:18:16Z")

</div>

**Describe the issue / Steps to reproduce:**  
We have upgraded our MediaWiki from 1.39 to 1.43 and we had to upgrade extensions as well.  
One of them is SimpleTasks. We have downloaded the extension for MW 1.43 but it complained about missing dependency “_SimpleTasks requires Checklists”_.  
But if you go to the Download link on [Extension:Checklist - MediaWiki](https://www.mediawiki.org/wiki/Extension:Checklist) you will land on \*BlueSpiceChecklist \*download page.

I was able to change “_Checklists” to_ _“BlueSpiceChecklist”_ in _SimpleTasks/extension.json_ file and MW seems to work now.

Is it a bug or am I doing something wrong?

**Expected behavior:**  
I would expect it to work with both _Checklists_ or _BlueSpiceChecklist_.

**What was the error message/error log?**  
`[Wed Jan 21 10:50:45.842931 2026] [php:error] [pid 12015:tid 12015] [client 10.64.6.54:33902] PHP Fatal error: Uncaught MediaWiki\Registration\ExtensionDependencyError: SimpleTasks requires Checklists to be installed.\n in /usr/share/mediawiki/includes/registration/ExtensionRegistry.php:478\nStack trace:\n#0 /usr/share/mediawiki/includes/registration/ExtensionRegistry.php(330): MediaWiki\Registration\ExtensionRegistry->readFromQueue()\n#1 /usr/share/mediawiki/includes/Setup.php(295): MediaWiki\Registration\ExtensionRegistry->loadFromQueue()\n#2 /usr/share/mediawiki/includes/WebStart.php(85): require_once(‘…’)\n#3 /usr/share/mediawiki/index.php(50): require(‘…’)\n#4 {main}\n thrown in /usr/share/mediawiki/includes/registration/ExtensionRegistry.php on line 478`

**System info:**  
[view system requirements](https://en.wiki.bluespice.com/wiki/Setup:System_requirements)

- OS: Debian 13
- Server: Apache 2.4.66
- PHP: PHP 8.4.16
- Database: MariaDB 11.8.3
- Browser version: Firefox 147.0.1

---

<div class="post-metadata">

**Author:** ![huaj1ng](https://dub1.discourse-cdn.com/flex017/user_avatar/community.bluespice.com/huaj1ng/32/116_2.png) [@huaj1ng](https://community.bluespice.com/u/huaj1ng)\
**Post date:** [January 21, 2026, 5:44pm UTC](https://community.bluespice.com/t/simpletasks-requires-checklists/362/2 "2026-01-21T17:44:02Z")

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Hello Pavel,

welcome to the community. Please note that there are two different extensions co-existing in the ecosystem of BlueSpice / MediaWiki:

- Extension:Checklists (with plural “s” in the end), see [Extension:Checklists - MediaWiki](https://www.mediawiki.org/wiki/Extension:Checklists)
- Extension:BlueSpiceChecklist , see [Extension:BlueSpiceChecklist - MediaWiki](https://www.mediawiki.org/w/index.php?title=Extension:BlueSpiceChecklist&redirect=no) that redirects to [Extension:Checklist - MediaWiki](https://www.mediawiki.org/w/index.php?title=Extension:Checklist). In the future, when this extension no longer requires BlueSpiceFoundation, the prefix in its name will officially retire.

For extension SimpleTasks, it has the following requirements:

```json
	"requires": {
		"MediaWiki": ">= 1.43.0",
		"extensions": {
			"Checklists": ">= 2.0.0",
			"AtMentions": ">= 2.0.0",
			"DateTimeTools": ">= 2.0.0"
		}
	},

```

The “Checklists” here refers to [Extension:Checklists - MediaWiki](https://www.mediawiki.org/wiki/Extension:Checklists) (instead of the one you quoted).

The MediaWiki extension loading mechanism relies on the directory name to load extensions correctly, e.g with `wfLoadExtension( 'Checklists' );` the wiki will expect directory `/usr/share/mediawiki/extensions/Checklists` in your case. Using BlueSpiceChecklist under this directory will cause other errors, as it is actually not the required extension and cannot interact with SimpleTasks as expected.

Wish that you enjoy the new MediaWiki LTS = )

Greetings,  
Hua