Default exception handler cache_helper::purge_all Moodle

Problema:

Default exception handler: Detectado un error de codificación, debe ser corregido por un programador:

The data source class does not exist. Debug:
Error code: codingerror
* line 513 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 1737 of /lib/upgradelib.php: call to cache_helper::purge_all()
* line 677 of /admin/index.php: call to upgrade_noncore()
, referer: http://www.sitio.com/moodle/admin/index.php

Solución:

cd moodledata/muc

mv config.php config.php.bak.fecha

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