Thread:Extension talk:MultimediaViewer/Black site on close MultimediaViewer/reply (2)

There is such error in the console when I'm closing viewer: TypeError: this.data(...) is undefined in load.php:10 file:line. Aaand when I click on load.php:10 it shows in Debugger script, which path is: myhost/mywiki/load.php?debug=false&lang=pl&modules=jquery.color,colorUtil,fullscreen,tipsy|mmv|mmv.ThumbnailWidthCalulator,ligskin=vector&version=20141219T101025Z&*

I don't know where it's Commons? ;> I've just uploaded images with normal option in toolbox, so they are in "images" folder. I didn't install this extension, because it is not necessary, is it?

Other informations: In my LocalSettings.php file I have this:
 * require_once "$IP/extensions/MultimediaViewer/MultimediaViewer.php";
 * require_once "$IP/extensions/BetaFeatures/BetaFeatures.php";
 * $wgMediaViewerIsInBeta = true;
 * $wgEnableMediaViewerForLoggedInUsersOnly = true;