What does error 500 after laravel login mean? - laravel

I am sorry to bother everyone today with this. I have inherited a Laravel based website and came across an issue this morning. The public facing front end seems to be fine. But when I go into the admin backend I am getting an error 500. I am not so efficient with Composer and Artisan so I don't want to do to much without some guidance. I don't know what information you will need from me. I am running Laravel 5.2 on Ubunto 16.04.
I tried generating a new key and clearing caches. The staging site that is setup seems to be running fine. It is just out of date since we are updating the data weekly.
I have checked the logs. The latest entry is:
ErrorException:
The MAC is invalid.
(View: /var/www/d3multisport.com/resources/views/layouts/admin.blade.php)
(View: /var/www/d3multisport.com/resources/views/layouts/admin.blade.php) in /var/www/d3multisport.com/vendor/laravel/framework/src/Illuminate/Encryption/BaseEncrypter.php:48
Stack trace: #0 /var/www/d3multisport.com/vendor/laravel/framework/src/Illuminate/View/Engines/PhpEngine.php(44): Illuminate\View\Engines\CompilerEngine->handleViewException(Object(ErrorException), 1)
...
#72 /var/www/d3multisport.com/public/index.php(52): Illuminate\Foundation\Http\Kernel->handle(Object(Illuminate\Http\Request))
If anyone can help it would be greatly appreciated.
Kevin

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