Unable to Create Recurring Payment with Pro Sites

I'm using Pro Sites with the latest update. I am getting this error message in the Account History Log when attempting to upgrade a site to a Payment Plan. I'm already successfully accepting/creating recurring payments using PayPal Express with other sites. Its just happening with this one site.

User creating new subscription via PayPal Express: Problem creating the subscription after successful initial payment. User may need to renew when the first period is up: Timeout processing request

Any thoughts on this?