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我想升級Moodle 2.7至3.1。但由於某種原因,我不能。這是錯誤:Moodle - 檢測到編碼錯誤,它必須由程序員修復:數據源類不存在
Coding error detected, it must be fixed by a programmer: The data source class does not exist.
Debug info:
Error code: codingerror
Stack trace:
line 498 of /cache/classes/definition.php: coding_exception thrown
line 515 of /cache/classes/helper.php: call to cache_definition::load()
line 480 of /cache/classes/helper.php: call to cache_helper::purge_store()
line 323 of /admin/index.php: call to cache_helper::purge_all()
這可能是什麼問題?