Warning: Array to string conversion in /home/u1643084/public_html/conferences/lib/pkp/classes/i18n/Locale.php on line 548

Warning: array_flip(): Can only flip string and integer values, entry skipped in /home/u1643084/public_html/conferences/lib/pkp/classes/i18n/Locale.php on line 391

Fatal error: Uncaught TypeError: Symfony\Component\HttpFoundation\Request::formatLocale(): Argument #1 ($locale) must be of type string, array given in /home/u1643084/public_html/conferences/lib/pkp/lib/vendor/symfony/http-foundation/Request.php:1743 Stack trace: #0 [internal function]: Symfony\Component\HttpFoundation\Request::formatLocale() #1 /home/u1643084/public_html/conferences/lib/pkp/lib/vendor/symfony/http-foundation/Request.php(1690): array_map() #2 /home/u1643084/public_html/conferences/lib/pkp/classes/i18n/Locale.php(563): Symfony\Component\HttpFoundation\Request->getPreferredLanguage() #3 /home/u1643084/public_html/conferences/lib/pkp/classes/i18n/Locale.php(141): PKP\i18n\Locale->getPreferredLocale() #4 /home/u1643084/public_html/conferences/lib/pkp/classes/i18n/Locale.php(490): PKP\i18n\Locale->getLocale() #5 /home/u1643084/public_html/conferences/lib/pkp/classes/i18n/Locale.php(348): PKP\i18n\Locale->_getLocaleCache() #6 /home/u1643084/public_html/conferences/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Support/Facades/Facade.php(363): PKP\i18n\Locale->getCountries() #7 /home/u1643084/public_html/conferences/lib/pkp/classes/user/form/RegistrationForm.php(116): Illuminate\Support\Facades\Facade::__callStatic() #8 /home/u1643084/public_html/conferences/lib/pkp/classes/form/Form.php(156): PKP\user\form\RegistrationForm->fetch() #9 /home/u1643084/public_html/conferences/lib/pkp/pages/user/RegistrationHandler.php(66): PKP\form\Form->display() #10 [internal function]: PKP\pages\user\RegistrationHandler->register() #11 /home/u1643084/public_html/conferences/lib/pkp/classes/core/PKPRouter.php(327): call_user_func() #12 /home/u1643084/public_html/conferences/lib/pkp/classes/core/PKPPageRouter.php(249): PKP\core\PKPRouter->_authorizeInitializeAndCallRequest() #13 /home/u1643084/public_html/conferences/lib/pkp/classes/core/Dispatcher.php(157): PKP\core\PKPPageRouter->route() #14 /home/u1643084/public_html/conferences/lib/pkp/classes/core/PKPApplication.php(429): PKP\core\Dispatcher->dispatch() #15 /home/u1643084/public_html/conferences/index.php(21): PKP\core\PKPApplication->execute() #16 {main} thrown in /home/u1643084/public_html/conferences/lib/pkp/lib/vendor/symfony/http-foundation/Request.php on line 1743