Error 500 in OPS 3.4

[netmas]

Hello! I'm working on a OPS 3.4.0.4. I installed and activated the defaultTranslation Plugin.
->
After this I went to submissions -> (Chose a submission) View ->Preprint-> Permissions & Disclosures. After that I switched the language to spanish.

After this I got error 500 on the page. And when looking at the log I found this:

[13-Mar-2024 10:17:09 America/Argentina/Cordoba] PHP Fatal error: Uncaught TypeError: ucfirst(): Argument #1 ($string) must be of type string, null given in /home/paideias/preprints.latarxiv.org/lib/pkp/classes/i18n/LocaleMetadata.php:190
Stack trace:
#0 /home/paideias/preprints.latarxiv.org/lib/pkp/classes/i18n/LocaleMetadata.php(190): ucfirst()
#1 /home/paideias/preprints.latarxiv.org/plugins/generic/defaultTranslation/DefaultTranslationPlugin.php(123): PKP\i18n\LocaleMetadata->getScript()
#2 [internal function]: APP\plugins\generic\defaultTranslation\DefaultTranslationPlugin->APP\plugins\generic\defaultTranslation{closure}()
#3 /home/paideias/preprints.latarxiv.org/plugins/generic/defaultTranslation/DefaultTranslationPlugin.php(126): uasort()
#4 /home/paideias/preprints.latarxiv.org/plugins/generic/defaultTranslation/DefaultTranslationPlugin.php(89): APP\plugins\generic\defaultTranslation\DefaultTranslationPlugin->getSuitableLocales()
#5 /home/paideias/preprints.latarxiv.org/plugins/generic/defaultTranslation/DefaultTranslationPlugin.php(54): APP\plugins\generic\defaultTranslation\DefaultTranslationPlugin->translate()
#6 [internal function]: APP\plugins\generic\defaultTranslation\DefaultTranslationPlugin->APP\plugins\generic\defaultTranslation{closure}()
#7 /home/paideias/preprints.latarxiv.org/lib/pkp/classes/plugins/Hook.php(139): call_user_func_array()
#8 /home/paideias/preprints.latarxiv.org/lib/pkp/classes/plugins/Hook.php(113): PKP\plugins\Hook::run()
#9 /home/paideias/preprints.latarxiv.org/lib/pkp/classes/i18n/Locale.php(421): PKP\plugins\Hook::call()
#10 /home/paideias/preprints.latarxiv.org/lib/pkp/classes/i18n/Locale.php(104): PKP\i18n\Locale->translate()
#11 /home/paideias/preprints.latarxiv.org/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Foundation/helpers.php(938): PKP\i18n\Locale->get()
#12 /home/paideias/preprints.latarxiv.org/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Foundation/helpers.php(973): trans()
#13 /home/paideias/preprints.latarxiv.org/plugins/themes/default/DefaultThemePlugin.php(110): __()
#14 /home/paideias/preprints.latarxiv.org/lib/pkp/classes/plugins/ThemePlugin.php(130): APP\plugins\themes\default\DefaultThemePlugin->init()
#15 [internal function]: PKP\plugins\ThemePlugin->themeRegistered()
#16 /home/paideias/preprints.latarxiv.org/lib/pkp/classes/plugins/Hook.php(139): call_user_func_array()
#17 /home/paideias/preprints.latarxiv.org/lib/pkp/classes/plugins/Hook.php(113): PKP\plugins\Hook::run()
#18 /home/paideias/preprints.latarxiv.org/lib/pkp/classes/plugins/PluginRegistry.php(128): PKP\plugins\Hook::call()
#19 /home/paideias/preprints.latarxiv.org/lib/pkp/classes/components/forms/context/PKPThemeForm.php(66): PKP\plugins\PluginRegistry::loadCategory()
#20 /home/paideias/preprints.latarxiv.org/lib/pkp/pages/management/ManagementHandler.php(204): PKP\components\forms\context\PKPThemeForm->__construct()
#21 /home/paideias/preprints.latarxiv.org/lib/pkp/pages/management/ManagementHandler.php(93): PKP\pages\management\ManagementHandler->website()
#22 [internal function]: PKP\pages\management\ManagementHandler->settings()
#23 /home/paideias/preprints.latarxiv.org/lib/pkp/classes/core/PKPRouter.php(334): call_user_func()
#24 /home/paideias/preprints.latarxiv.org/lib/pkp/classes/core/PKPPageRouter.php(277): PKP\core\PKPRouter->_authorizeInitializeAndCallRequest()
#25 /home/paideias/preprints.latarxiv.org/lib/pkp/classes/core/Dispatcher.php(165): PKP\core\PKPPageRouter->route()
#26 /home/paideias/preprints.latarxiv.org/lib/pkp/classes/core/PKPApplication.php(388): PKP\core\Dispatcher->dispatch()
#27 /home/paideias/preprints.latarxiv.org/index.php(21): PKP\core\PKPApplication->execute()
#28 {main}
thrown in /home/paideias/preprints.latarxiv.org/lib/pkp/classes/i18n/LocaleMetadata.php on line 190
[13-Mar-2024 10:34:56 America/Argentina/Cordoba] ops: 404 Not Found