Error when trying to create a payment method

-- HikaShop version -- : HikaShop Starter: 2.6.0
-- Joomla version -- : Joomla! 3.4.5
-- PHP version -- : 5.3.10-1ubuntu3.21
-- Browser(s) name and version -- : Firefox 4.2
-- Error-message(debug-mod must be tuned on) -- : Blanc or white screen with only text?

I have the following problem when I click on payment options and will create a new one then I get a page without classification, see snapshot.

Hi,

You have a PHP fatal error ; please check your PHP error log.

Regards,

Okay Thanks Jerome, I look for it.

Hello Jerome I am now view this error log but where should I look for?

You can close this topic, because I received from the support of sisow.nl the solution.
Thanks