PAYPAL PAYMENT - JAVASCRIPTVOID ERROR WITH PRESTASHOP

[OLIVIER1509]

hello, 

Using Paypal module V.3.10.2 in Prestashop 1.6.1.4, when checking out on shopping cart, by clicking on PAYPAL button, "javascriptvoid" appear at the bottom the browser... and nothing else... no paypal page appear ....

for a test, you can log on www.led-import.com and similate an order...

anybody can help me ? 

Thanks

olivier