When I try to apply my voucher, I get the error "No Such certificate exists".

This error usually occurs when you enter the code incorrectly. You must enter all the dashes in the voucher. It is sometimes hard to distinguish the zeros 0 from the letter O and ones 1 from the letter I. Therefore, we recommend you copy and paste the code from living social to the box. To do this, simply highlight the voucher number on living social's website or in the email you received; right click on your mouse and choose copy. Click inside the promo box on our site where you need to enter the code. Right click again and choose "Paste". Your code should be in the box, but don't forget to click the "Apply" button.