You'll need to post a bit more information than that if you want assistance from the Community Forum.
How are you trying to do this?
On the app or via the web interface?
Have you switched from one to the other to see if that makes any difference?
What happens if you use this link?
Any error messages?
When were you last able to successfully buy a membership plan?
If you need to contact 48 support about this then see the links in my signature below.
