Paypal Express Subscription not working

Hi,
I'm trying to set up a paid subscription for a website using the membership plugin.
http://www.careerfitmom.ca/fitness/virtual-training-programs/

I have two membership levels (both activated) and a subscription (also active) that starts with one and upgrades to the next after 28 days.

The registration step 1 works but the paypal button (step 2) directs to a paypal error page that says:

Sorry — your last action could not be completed
If you were making a purchase or sending money, we recommend that you check both your PayPal account and your email for a transaction confirmation after 30 minutes.

If you came to this page from another website, please return to that site (don't use your browser's Back button) and restart your activity.

If you came from PayPal's website, click the PayPal logo in the upper-left corner to return to our home page and restart your activity. You might have to log in again.

What could be the cause of this and how should i attempt to fix it?
Thanks!