Mollie API doesen't work

Mollie API doesen't work

I installed Mollie API (last version) but cannot select a bank
After choosing iDeal I get also the error.

Fout
Betaal methode error

I bought this some weeks ago and can't get it working although I have already one older version working in a shop. So know how it works

But now I' m building in Joomla 3.4

Next step after choosing payment gives 0.00 price for shipment, where do I go wrong ?

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Aw: Mollie API doesen't work

1.https://www.webdesigner-profi.de/joomla-webdesign/joomla-shop/forum/posts/25/8788.html?lang=en#13

2. Set shipping price