Hello
I think problem because you have config only Friends only see post in facebook.
Now:
#1 You need remove this facebook application in:
www.facebook.com/settings?tab=applications
#2 In Your facebook application in tab Status & Review please choose "Yes"
#3: Delete old account in component and create new again
Note in step confirm facebook when click button "Connect with facebook" in step 2 you need selected "Publish"
You can see it in file guide install and config in package download
And fixed problem in file image your send. Please help me find and open file administrator/components/com_joautofacebook/views/accounts/tmpl/facebookpost.php and go to line 54 and add tag @ in line
joautofacebook::getFacebookPost
To
@joautofacebook::getFacebookPost
Or please send me joomla administrator via contact form? So we can check and help you
Best regards
Bach Pham