Pada saat instalasi pertama Vanilla Forums, kadang muncul error sebagai berikut.

The error occurred on or near: \applications\dashboard\controllers\api\localesapicontroller.php

 99: 
100:         $populate = function (array &$row, array $locales) {
101:             $displayNames = [];
102:             foreach ($locales as $locale) {
103:                 $displayName = \Locale::getDisplayLanguage($row["localeKey"], $locale);
104: 
105:                 // Standardize capitalization
106:                 $displayName = mb_convert_case($displayName, MB_CASE_TITLE);
107: 

Backtrace:

[C:\xampp\htdocs\vanilla\applications\dashboard\controllers\api\LocalesApiController.php:117] LocalesApiController->{closure}();
[C:\xampp\htdocs\vanilla\applications\dashboard\controllers\api\LocalesApiController.php:45] LocalesApiController->expandDisplayNames();
[C:\xampp\htdocs\vanilla\library\Vanilla\Models\LocalePreloadProvider.php:36] LocalesApiController->index();
[C:\xampp\htdocs\vanilla\library\Vanilla\Web\JsInterpop\ReduxActionPreloadTrait.php:51] Vanilla\Models\LocalePreloadProvider->createActions();
[C:\xampp\htdocs\vanilla\library\core\class.controller.php:1967] Gdn_Controller->getReduxActionsAsJsVariable();
[C:\xampp\htdocs\vanilla\library\core\class.controller.php:1471] Gdn_Controller->renderMaster();
[C:\xampp\htdocs\vanilla\library\core\class.pluggable.php:217] Gdn_Controller->xRender();
[C:\xampp\htdocs\vanilla\applications\dashboard\controllers\class.setupcontroller.php:155] Gdn_Pluggable->__call();
[C:\xampp\htdocs\vanilla\library\core\class.dispatcher.php:872] SetupController->index();
[C:\xampp\htdocs\vanilla\library\core\class.dispatcher.php:289] Gdn_Dispatcher->dispatchController();
[C:\xampp\htdocs\vanilla\index.php:29] Gdn_Dispatcher->dispatch();

Error tersebut terjadi karena tidak terbacanya bahasa yang digunakan oleh Vanilla Forums.

Cara mengatasinya adalah mengubah bahasa pada file \applications\dashboard\controllers\api\localesapicontroller.php baris ke-103 tersebut, sehingga kodenya menjadi

103:                 $displayName = "English";