I have a problem with the Klarna invoice module to OpenCart Version 2.1.0.1 (Sweden). When activating the Klarna payment module I get an message saying "Internal service error" in step 4 in the cart (the freight step). This message only appairs when Klarna invoice module is activated. Why is this? How can I fix it so I can use Klarna? Klarna is just saying that they can not help when it is a opencart module. Really would appreciate help to fix this issue.
(This is my website: http://www.snygga-strumpbyxor.se - however Klarna is not active for the moment.)
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