On my homepage after upload i have the problem that after the buy ("Kaufen") Button is pressed that there comes a "general error" message. When i test it locally it's fine, but online it does not work. 

Also in the Email there comes an error message i don't understand at all.

See attached Pictures for explanation. Can somebody of the development team help me with that. 

www.angelpower.ch is my homepage and the shop is at www.angelpower.ch/goettinnenkarten