Good morning donerite,
Something wrong might be happening, either you are 
- Entering some wrong data in the renewal process, or
- There is a problem with your credit card,
Try again and if the error persists try to take a screenshot of the error and send it to
billingSupport@flyordie.com requesting support in this regard.
The team in charge will try to help you immediately.
If you can take a look here FAQ: 

https://www.flyordie.com/games/help/support/contents.html

 in order to try to get some help.

Good luck and regards✌
Dav7d