michalniks

hmurauer, du bist der Beste. Es löste das gleiche Problem in meinem PrestaShop 1.7.4.2 - ich hatte zwei % Zeichen im DB-Passwort.

I don't know how enable it on your hosting (ask your hosting provider), but if you are using XAMPP on your local PC, you have to uncomment line with extension=php_intl.dll in xampp/php/php.ini.

I have the same problem in the same version of PrestaShop (1.7.4.2). I've found that the solution can be enabling the php-intl extension, but on my server is this extension activated. The same issue occurs when I try resend email in the order detail or use another payment method (e.g. COD).