- Issue created by @alan.cole
- 🇦🇺Australia alan.cole
It seems the implementation in civictheme for extending the layout defined in civictheme.layouts.yml with the src/Plugins/ThreeColumnLayout.php is not possible.
https://www.drupal.org/node/2578731#using-class-key → Documentation says the class must be defined in a module, and not in the theme.
Note: You can specify a custom 'class' with layouts registered in both modules and themes, BUT the class itself MUST be in a module. Themes can't contain autoloadable class files.
This may be why it throws an error.