Uncaught PHP Exception Twig\\Error\\LoaderError: "Template "x is not defined in "core/themes/claro/templates/navigation/menu-local-task.html.twig" at line 30."

I had this error installing a late Drupal 9 and using the Claro back-end theme.

Uncaught PHP Exception Twig\\Error\\LoaderError: "Template "@claro/../images/src/hamburger-menu.svg" is not defined in "core/themes/claro/templates/navigation/menu-local-task.html.twig" at line 30." at /my-website/vendor/twig/twig/src/Loader/ChainLoader.php line 98, /admin/reports/updates

Solution

The solution was to downgrade twig

composer require twig/twig:2.15.2

This will eventually be fixed with a Drupal core upgrade