"Cannot call method "open""

Hello there!!

Have been struggling with this problem for a while now. I think that it has something with the eventlistener to do, but i dont have any suggestions of thoughts how i can solve that.

Becouse when i click on the eventlistener a new window could pop up, it does but it contains a error message which says. "Cannot call method "open". I have googled this problem but cant find any defects with the code which look like this: ~~~ LatestTipsLabel.addEventListener('click', function(){ "use strict"; var LatestWin, LatestInc; LatestInc = require('LatestTipsLabelWindow/Resource/app'); LatestWin = LatestInc; LatestWin.open(); }); ~~~

All help is greatful!

Thanks!