laravel 5.4 - User model misses admin property

I’ve recently added this package to my laravel 5.4 website and I’m having some difficulty getting it working properly. I’ve researched this error as much as I can and I am not getting any results going into the tracker table and when I go to the statistics pages, I get an error in big bold letters saying “User model misses admin property.” I have documented much of the issue on the link below, but I was wondering if anyone knew what this issue was, because I was unable to find a solution relating to it for laravel 5.4. Thank you for your help!

http://stackoverflow.com/questions/44034125/laravel-tracker-not-producing-results

Start with the linked Stack Overflow report and reproduce the issue on the Laravel 5.4 statistics pages. Check why the User model admin property error appears and why no results reach the tracker table; done means the pages load without that error and tracking results are recorded.

Written by the indexing model from the issue text.