Moodle: Coding error detected, it must be fixed by a programmer

Malam ini mau memberikan grade (nilai) untuk tugas siswa di moodle (assignment), tetapi muncul error:

Coding error detected, it must be fixed by a programmer: Failed to unserialise data from file. Either failed to read, or failed to write.

More information about this error
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Setelah googling, saya menemukan langkah penyelesaian masalah error tersebut:

Untuk kasus moodle saya:

root@debian:~# php /var/www/html/moodle/admin/cli/purge_caches.php

root@debian:~# cd /var/moodledata/cache

root@debian:/var/moodledata/cache# rm -rf cachestore_file

Intinya jalankan purge cache php pada bagian folder moodle/admin/cli

dan

hapus cachestore_file pada folder /moodledata/cache