note that that error is not from your computer at all is from the jQuery script from your wordpress theme.
if you purchased this theme contact the developer and have them update the theme for you, other than that make sure all plugins installed on your WordPress site are up to date.
Hi there Guys, I had a custom theme (developed by my self) and I updated the code and noted that I still had the same issue with this error, what I did to fix it was disable all my plugins and reanable them one by one. I note that one of my plugins when I eneble it (In my case was CalPress Calendar plugin) it give me the same error again. I left that plugin disabeled and now my WordPress instalation is working like a charm.
In other words review the plugins install on your wordpress site.
I hope it helps!
