Problem:
There was a file locked by cache store system.
Solutions:
- Execute script purgecaches to reset the cache system. your_site/admin/purge_caches.php
- Remove all files and directories under the directory /moodledata/cache
Note: It is always safe to rename the directory and create an empty one with the same name (cache). If you like, Number 2 has been more useful for me in the past.
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