Currency switching with SEF URLs on

I get the following error when switching currency and SEF URLs is turned on:

Fatal error: Call to undefined method CurrencyController::isIn() in /public_html/components/com_hikashop/router.php on line 108

I have a few alterations to the .htaccess file, but I've tried reverting them to the original joomla htaccess and the problem perssists.

Any idea what may be causing this?

joomla 1.5.23
hikashop 1.5.3

Please look at that thread:
www.hikashop.com/en/support/forum/4-how-...nds-error.html#24210

Thanks Nicolas, that fixed it.

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in the file components/com_hikashop/controllers/currency.php change the line:
class CurrencyController extends JController{
to:
class CurrencyController extends hikashopController{