Java script bug

Hi,

We are using the Simple WP Community Theme on our website, but we want to use the bol.com partner plug in (a plug in for a Dutch website), but it is not working with this theme because there are some errors in it. The creator of the plug in told us that it has to do with errors in the javascript.

When I go the the page (https://www.interlinguals.com/bol-com-test/) where we want to use the plug in, and I check the F12-function (in Chrome) it show this error:

Failed to load resource: the server responded with a status of 404 (Not Found)
Uncaught ReferenceError: QUnit is not defined test.core.js:2
Consider using ‘dppx’ units instead of ‘dpi’, as in CSS ‘dpi’ means dots-per-CSS-inch, not dots-per-physical-inch, so does not correspond to the actual ‘dpi’ of a screen. In media query expression: print, not all, (-webkit-min-device-pixel-ratio: 1.25), (min-resolution: 120dpi)
Consider using ‘dppx’ units instead of ‘dpi’, as in CSS ‘dpi’ means dots-per-CSS-inch, not dots-per-physical-inch, so does not correspond to the actual ‘dpi’ of a screen. In media query expression: print, not all, (-webkit-min-device-pixel-ratio: 1.25), (min-resolution: 120dpi)

event.returnValue is deprecated. Please use the standard event.preventDefault() instead.

Is there a possibility that this bug can be fixed?

I hope you can help us. Thanks in advance.