genine

I used to be able to export videos all the time to my Facebook account and now i keep getting this i need to 'reauthorize my Facebook' error message when i try to upload videos. I click a button to proceed. Then it opens a blank window with nothing in it. I am always logged in to Facebook in my computer and my videopad app is enabled on Facebook in Facebook app settings. Here is picture of the error message. Any help would be appreciated. Here is a a screenshot. https://drive.google.com/file/d/1GK-AY2lHq6dfMMOqgk2er0VG2wI-7p1v/view?usp=drivesdk