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Five Common Causes Behind Most Moodle 5.1 to 5.2 Upgrade Failures

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Developers upgrading Moodle from version 5.1 to 5.2 frequently encounter failures traced to five recurring technical issues. The most common problem is an incorrectly configured web server document root, as Moodle 5.1 and later require the server to point to the public/ subdirectory. Other frequent causes include missing r.php router configuration, an absent vendor/ directory requiring Composer to be run from the Moodle root, outdated plugins referencing deprecated Mustache class names, and stale caches that can be cleared via CLI or the admin panel. Experts recommend backing up code, moodledata, and the database before upgrading, and always testing on a staging copy of the site before applying changes to production.

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