Implementing event manager, poll, homepage plugins

I have installed elgg 1.9.7 and installed the plugins Event manager, poll. I could initially login and add an event and it worked properly. Even the poll plugin.... Event manager needs widget manager and when i install and go to view site, it does not land on homepage.

This apart when i click events the white page appears.

The same thing for poll.

When i decativate the widget manager the homepage landing is fine when i click veiw site.

How is this happening and how do i fix it.?