Type error: jQuery ...update virtuemart cart module is not a function

[gajdoseni]

I had problem with One step checkout plugin, the developer support solved it, and he wrote me, that there is a jQuery error also on my site.
Type error: jQuery ...update virtuemart cart module is not a function

I have no idea, what is this, and how to solve it. Could anyone help please?
Virtuemart cart is not working properly, I hope this could solve my problems.
My site: http://www.geishabride.com

Joomla 3.4.1, Virtuemart 3.0.6

Thanks,
Eniko

[jenkinhill]

To debug JavaScript issues see http://forum.virtuemart.net/index.php?topic=119638.0

You are loading 3 different versions of jQuery which may be the root of the problem.

[gajdoseni]

Dear Jenkinhill,

Thank you for your reply! I was reading the linked post, but unfortunatelly I'm not familiar with this jquery thig at all.
I have jQuery Easy plugin, tried to make it work, but don't know how to set it up.
What can cause this, how could I solve it?

Eniko