Cause of the vads_language error

The format of the field is incorrect.

The vads_language field defines the language of the payment page (ISO 639-1 standard). It must consist of alphabetic characters with a fixed length of 2 characters (a2).

Language ISO 639-1 standard
German de
English en
Chinese zh
Spanish es
French fr
Italian it
Japanese ja
Dutch nl
Polish pl
Portuguese pt
Russian ru
Swedish sv
Turkish tr

If the field has not been sent or is empty, the payment page will be shown in the language of the buyer’s browser

If you have confided the administration of your shop to a Web agency, send them the e-mail notification you received.