# 500 Error when editing using Visual Editor

**URL:** <https://community.bluespice.com/t/500-error-when-editing-using-visual-editor/54>\
**Category:** Bugs\
**Created:** [December 21, 2023, 2:52pm UTC](https://community.bluespice.com/t/500-error-when-editing-using-visual-editor/54 "2023-12-21T14:52:52Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![dafogary](https://avatars.discourse-cdn.com/v4/letter/d/8c91f0/32.png) [@dafogary](https://community.bluespice.com/u/dafogary)\
**Post date:** [December 21, 2023, 2:52pm UTC](https://community.bluespice.com/t/500-error-when-editing-using-visual-editor/54/1 "2023-12-21T14:52:53Z")

</div>

**Describe the issue / Steps to reproduce:**  
When I try and edit the main page I get a 500 error.

**Expected behavior:**  
I would expect to be able to edit the content using Visual Editor.

**What was the error message/error log?**  
[Thu Dec 21 14:31:55.621732 2023] [php:error] [pid 1513] [client ::1:54026] PHP Fatal error: Declaration of MediaWiki\Extension\Checklists\ParsoidExt\ChecklistProcessor::wtPostprocess(Wikimedia\Parsoid\Ext\ParsoidExtensionAPI $extApi, Wikimedia\Parsoid\DOM\Node $root, array $options): void must be compatible with Wikimedia\Parsoid\Ext\DOMProcessor::wtPostprocess(Wikimedia\Parsoid\Ext\ParsoidExtensionAPI $extApi, Wikimedia\Parsoid\DOM\Node $root, array $options, bool $atTopLevel): void in /var/www/html/bluespice/extensions/Checklists/src/ParsoidExt/ChecklistProcessor.php on line 21, referer: [http://localhost/bluespice/index.php/Main\_Page?veaction=edit](http://localhost/bluespice/index.php/Main_Page?veaction=edit)  
[Thu Dec 21 14:32:07.894716 2023] [php:error] [pid 1514] [client ::1:43166] PHP Fatal error: Declaration of MediaWiki\Extension\Checklists\ParsoidExt\ChecklistProcessor::wtPostprocess(Wikimedia\Parsoid\Ext\ParsoidExtensionAPI $extApi, Wikimedia\Parsoid\DOM\Node $root, array $options): void must be compatible with Wikimedia\Parsoid\Ext\DOMProcessor::wtPostprocess(Wikimedia\Parsoid\Ext\ParsoidExtensionAPI $extApi, Wikimedia\Parsoid\DOM\Node $root, array $options, bool $atTopLevel): void in /var/www/html/bluespice/extensions/Checklists/src/ParsoidExt/ChecklistProcessor.php on line 21, referer: [http://localhost/bluespice/index.php/Main\_Page?veaction=edit](http://localhost/bluespice/index.php/Main_Page?veaction=edit)

> Blockquote

**Resolution**  
In the code specified:

/var/www/html/bluespice/extensions/Checklists/src/ParsoidExt/ChecklistProcessor.php

Change

public function wtPostprocess(  
ParsoidExtensionAPI $extApi,  
Node $root,  
array $options  
): void {  
$wikiTextPostprocessor = new WikiTextPostProcessor( new ParsoidListItemProvider() );  
$wikiTextPostprocessor-\>processDOM( $root );  
}

To

public function htmlPostprocess(  
ParsoidExtensionAPI $extApi,  
Node $root,  
array $options  
): void {  
$wikiTextPostprocessor = new WikiTextPostProcessor( new ParsoidListItemProvider() );  
$wikiTextPostprocessor-\>processDOM( $root );  
}

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

- OS: Ubuntu 20.04
- Server: Apache 2.4.41
- PHP: PHP 8.2.13
- Database: MariaDB 10.3.38
- BlueSpice version: BlueSpice free 4.3.3
- Browser version: Edge

---

<div class="post-metadata">

**Author:** ![rvogel](https://avatars.discourse-cdn.com/v4/letter/r/eada6e/32.png) [@rvogel](https://community.bluespice.com/u/rvogel)\
**Post date:** [December 21, 2023, 3:10pm UTC](https://community.bluespice.com/t/500-error-when-editing-using-visual-editor/54/2 "2023-12-21T15:10:09Z")

</div>

Thanks for reporting. Very odd. BlueSpice 4.3.3 should have a MediaWiki 1.39, which should be compatible. We’ll investigate.