3.2.2 - Board unavailable: cache issue

As advised by stevemaury on the PHPBB support forum, I am reporting a bug which broke my board a few minutes after deactivating Viglink extension.

Details and logs are in this topic

 Workaround : As advised in the other topics, I deleted the content of the cache folder (except .htaccess and index,html), which allowed me to access the ACP and clear the forum cache. The issue then went away.