"XML description is missing an element: structure." error with default Chameleon Layout on CanastaWiki

[zuobot]

Context

I installed CanastaWiki on an Ubuntu localhost. Canasta has Chameleon skin come by default.

The overall contents of Canasta are as follows:

• Chameleon Version: 4.2.1
• Canasta version: built at 2024-02-13 22:03:30 from git commit 24df936.
• Debian Linux v. 11 ("Bullseye")
• Apache HTTP Server v. 2.4
• MySQL (via its own Docker image)
• PHP v. 7.4
• MediaWiki v. 1.39.1

UPDATE 2024-04-08: I tried to update Chameleon to version 4.3.0, but the issue is still remain.

Issue

I loaded default layouts (navhead, stickyhead.xml...) from Customization.md page

Add into LocalSettings.php as in the guide: $egChameleonLayoutFile= __DIR__ . '/layout/navhead.xml';

However, when I reload the wiki, the issue is as below:

MediaWiki internal error.

Original exception: [f8bc8a0ea719f26b05e99198] /wiki/Special:Version MWException: /mediawiki/config/layout/navhead.xml: XML description is missing an element: structure.
Backtrace:
from /var/www/mediawiki/w/canasta-skins/chameleon/src/ComponentFactory.php(83)
#0 /var/www/mediawiki/w/canasta-skins/chameleon/src/Chameleon.php(151): Skins\Chameleon\ComponentFactory->getRootComponent()
#1 /var/www/mediawiki/w/canasta-skins/chameleon/src/Chameleon.php(126): Skins\Chameleon\Chameleon->addSkinModulesToOutput()
#2 /var/www/mediawiki/w/includes/skins/SkinTemplate.php(243): Skins\Chameleon\Chameleon->setupTemplateForOutput()
#3 /var/www/mediawiki/w/canasta-skins/chameleon/src/Chameleon.php(111): SkinTemplate->prepareQuickTemplate()
#4 /var/www/mediawiki/w/includes/skins/SkinTemplate.php(146): Skins\Chameleon\Chameleon->prepareQuickTemplate()
#5 /var/www/mediawiki/w/includes/skins/SkinTemplate.php(177): SkinTemplate->generateHTML()
#6 /var/www/mediawiki/w/includes/OutputPage.php(2876): SkinTemplate->outputPage()
#7 /var/www/mediawiki/w/includes/MediaWiki.php(922): OutputPage->output()
#8 /var/www/mediawiki/w/includes/MediaWiki.php(562): MediaWiki->main()
#9 /var/www/mediawiki/w/index.php(50): MediaWiki->run()
#10 /var/www/mediawiki/w/index.php(46): wfIndexMain()
#11 {main}

Exception caught inside exception handler: [f8bc8a0ea719f26b05e99198] /wiki/Special:Version MWException: /mediawiki/config/layout/navhead.xml: XML description is missing an element: structure.
Backtrace:
from /var/www/mediawiki/w/canasta-skins/chameleon/src/ComponentFactory.php(83)
#0 /var/www/mediawiki/w/canasta-skins/chameleon/src/Chameleon.php(151): Skins\Chameleon\ComponentFactory->getRootComponent()
#1 /var/www/mediawiki/w/canasta-skins/chameleon/src/Chameleon.php(126): Skins\Chameleon\Chameleon->addSkinModulesToOutput()
#2 /var/www/mediawiki/w/includes/skins/SkinTemplate.php(243): Skins\Chameleon\Chameleon->setupTemplateForOutput()
#3 /var/www/mediawiki/w/canasta-skins/chameleon/src/Chameleon.php(111): SkinTemplate->prepareQuickTemplate()
#4 /var/www/mediawiki/w/includes/skins/SkinTemplate.php(146): Skins\Chameleon\Chameleon->prepareQuickTemplate()
#5 /var/www/mediawiki/w/includes/skins/SkinTemplate.php(177): SkinTemplate->generateHTML()
#6 /var/www/mediawiki/w/includes/OutputPage.php(2876): SkinTemplate->outputPage()
#7 /var/www/mediawiki/w/includes/exception/MWException.php(181): OutputPage->output()
#8 /var/www/mediawiki/w/includes/exception/MWException.php(215): MWException->reportHTML()
#9 /var/www/mediawiki/w/includes/exception/MWExceptionHandler.php(129): MWException->report()
#10 /var/www/mediawiki/w/includes/exception/MWExceptionHandler.php(248): MWExceptionHandler::report()
#11 /var/www/mediawiki/w/includes/MediaWiki.php(581): MWExceptionHandler::handleException()
#12 /var/www/mediawiki/w/index.php(50): MediaWiki->run()
#13 /var/www/mediawiki/w/index.php(46): wfIndexMain()
#14 {main}

Please support me. I tried to search but the most revelant answer is 9 years ago I also check ComponentFactory.php and getRootComponent() function, but cannot figured out the issue. Thanks for your support.

[jeffw16]

Turns out, from discussions on the Canasta issue page, that this was not related to any issue inside of Chameleon. There is some confusion on how to store custom design XML files in Canasta. I have addressed it in CanastaWiki/Canasta#378.