I'm building a subscription page. I need to take a singel

I'm building a subscription page. I need to take a singel payment of $179 then $19 a week indefinedtley after that. I think I'm set up properly but when I try it I get en error...

"Invalid Regular period. You must specify valid values for the A3, P3, and T3 parameters for a subscription."

http://v3coach.com/subscribe/

Am I setting it up wrong?