Klarna Payment dosn´t work after update VM 2.026

[asticher]

We´ve updated VM Shop from 2.012 to  2.026d via the joomla extension manager.
Also VM AIO and the VM Plugin Tabelle was updated.
After this the Klarna Payment Options (e.g. Klarna invoice) vanished in the shopping cart.
I deactivated the "VM - Payment, Klarna" (under extensions/plugins) and activated the new Plugin "KlarnaCheckout"
Now all Options are visible again but when i click one of these options a message pops up on top:

An error occurred with the payment Rechnung. Please choose another payment method

All permissions on server are set after the update.
The FTP User ist correct.
THX for any help indeed!!

[alatak]

Hello

Try again log in as admin. You will have more infos that are only displayed to administrator.
Copy / Paste the error here