You’re opening a new web page going to host www.shop-swimmingpool.at that is not part of your ExpressionEngine CMS install.
Please double check that the address is correct.
https://www.shop-swimmingpool.at/3-50-x-0-90-m-x-0-6-mm-poolfolie-schwimmbadfolie-350-x-90-pool-innenfolie.html