Membership Problems with PayPal Payments Standard Gateway

I trying to set up a subscription for my site. $5 first month and renews every month thereafter at $10 per month. After register a user, click subscribe and am directed to Paypal payment page I log in through Paypal sandbox mode I get this error:

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.
We are sorry, we are experiencing temporary difficulties. Please try again later. If this error occurred while making a payment, avoid duplicate payments by checking your Account Overview before resending a payment.

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Message 3005

I have gone through old forum posts and still can't seem to get this to work. Any advice? Thanks!