Checkout errors are particularly aggrivating; we understand.
If you are getting an error at checkout there could be a couple of reasons.
1.) Check to ensure the information you're entering is correct. Credit Card expiration dates should be entered with the "/" between the two digit MM and YY such as "02/22"
2.) Ensure you are checking the box at the bottom to accept the terms & conditions of the sale.
If steps 1 and 2 do not remedy your problem, we have had some success with the following:
1.) Try a different browser. Firefox, Chrome, Internet Explorer are a few examples
2.) Try clearing your browser cache.
3.) Try on a PC/Mac or your mobile device.
If you need further assistance, simply open a ticket and we'll see if we can further assist.