Hi,
with latest K2.7 and latest Widgetkit 2.7.4 AND multilanguage, we get a fatal error when trying to save a K2 item with the widgetkit code in it.
So in my K2 item I have:
<p>[widgetkit id="1" name="testwidget"]</p>

The content provider of the widget MUST be K2 for the problem to show. If I use any other content provider, it works just fine. But with K2 as widgetkit content provider, all we get is:

Fatal error: Call to undefined method JApplicationAdministrator::getLanguageFilter() in \modules\mod_k2_content\helper.php on line 202

Thanks for any help with this!

Hello,

The error indicates that somehow the K2 content module is triggered in the administration area.
This is a widgetkit issue, you need to address this issue to the widgetkit devs.

I am having the same issue. Did anyone find a solution to this?

You need to contact the widgetkit devs regarding this issue.
The K2 Content module is not being triggered in the backend by K2.