Latest update causing error

I just updated your Featured Video Plus plugin which previously worked wonderful. Now it is causing an error when trying to start a new post. Every time we click new-post we get this error window saying “Are you sure you want to do this?” And “Please try again” hyperlink. When we click “Please try again” it returns to the dashboard. See this screen grab: https://www.cctv-america.com/wp-content/uploads/2016/12/WordPress-Failure-Notice-FeaturedVideo.png

I know it is your plug in because after deactivating, everything works fine for new-post. I uninstalled, downloaded a fresh zip version of 2.3.0 , installed again and got the same error again. We have currently deactivated.