The components/languages/src/languages.json file doesn't exist.

As long as this error will not be corrected, only the English (United Kingdom) (en_GB) language will be available.

Create missing locales folders Updating plugin tranlations - Core wikindx domain - List all PHP files to /var/www/alternc/d/dominiquem/www/dpublic.dmeeus.be/wikindx/components/languages/src/wikindx.lst - Extract all translatable strings in file /var/www/alternc/d/dominiquem/www/dpublic.dmeeus.be/wikindx/components/languages/src/wikindx.pot - Merge and compile translations: