Fatal error

Hi guys,

So I was working on my site and I wanted to activate plugin JigoShop 1.7 and suddenly my site disappeared and now it shows only

Fatal error: Call to undefined method paypal::setParams() in /home3/besome1/public_html/wp-content/plugins/ready-ecommerce/classes/frame.php on line 64

everywhere I go, whether on my site link http://www.besomeone.eu or my dashboard. Please help, I had done so much on it and I dont want to lose it.