Free subscription error

I am using this version.

Membership 3.4.3 Beta

Japanese currency

I tried 2 different price

0 and 10000

gateway I am using is

PayPal Single Payments Gateway only

when 0

http://raku27.net/error_member/004.jpg

When I click on “subscribe”, nothing happen.

then change the price to 10000

http://raku27.net/error_member/005.jpg

it is working fine.

How can I create free subscription plan?