Hey put this line in your .htaccess file at the end (.htaccess can be found in root of your site ):
SetEnvIf Authorization .+ HTTP_AUTHORIZATION=$0
IF above does not works then please change the above line to :
SetEnvIf Authorization .+ HTTP_AUTHORIZATION=$1
When you put this code on.htaccess file after that you can open your app then the login will work properly
and also the Facebook and google login isn't work in the app.
also i am set the featured course :http://prntscr.com/onb0m1 and you should set the featured course by go to wp-admin=>LMS=>All Courses after that select this : http://prntscr.com/onb1hk