Problem with PayPal in ver 2.9.9b

[ghooton]

I get the following error :
10525: This transaction cannot be processed. The amount to be charged is zero
I have  :-
PHP Built On    Linux serv01.am8.siteground.biz 2.6.32.59-sg3 #9 SMP Wed Sep 26 03:29:25 CDT 2012 x86_64
Database Version    5.5.36-34.2-log
Database Collation    utf8_general_ci
PHP Version    5.3.29
Web Server    Apache
WebServer to PHP Interface    cgi-fcgi
Joomla! Version    Joomla! 3.3.3 Stable [ Ember ] 25-July-2014 13:00 GMT
Joomla! Platform Version    Joomla Platform 13.1.0 Stable [ Curiosity ] 24-Apr-2013 00:00 GMT
User Agent    Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:32.0) Gecko/20100101 Firefox/32.0

//Ger

[alatak]

Hello
You are using Express checkout ?