Problem about create new PAYMENT !!!!

Problem about create new PAYMENT !!!!

When I will setup a new payment method , System has erroe message >>>>

Fatal error: Call to undefined function getMainCurrencyCode() in /home/thaisel1/domains/slimshapeshop.com/public_html/administrator/components/com_jshopping/controllers/payments.php on line 75

How to solve this problem.

Thank you

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Aw: Problem about create new PAYMENT !!!!

Update joomshopping Need step to step

or

Component Update FULL -> 3.18.1 (min. 3.2.0)
http://www.webdesigner-profi.de/joomla-webdesign/joomla-shop/downloads/updates.html?lang=en