[TYPO3-commerce] No payment possible: class not set!:, file not found

[Volker Graubaum]

Hi,

> I have a similar problem, only I _have_ set classname in the DB-table.
> 
> The strange thing is that if I select a different payment from the
> dropdown and change it back again (which submits tx_commerce_pi[payArt]
> to add the payment article), everything works as expected.
> 
> Is this a known bug or am I doing something wrong?

You're doing something wrong ;-)
there is a TS setting for the default payment Article.
I bet the ID isn't a valid payment article, so no article is insert into 
the basket by default. When changing the article (by dropdown) you
insert it into the basket, and everythings work.

Greetings Volker