Warning: Undefined variable $entity in C:\WebServer\htdocs\bookshelf\storage\framework\views\a75889706a2fa4a029359f85b63afbdb.php on line 2

Fatal error: Uncaught Error: Call to a member function isA() on null in C:\WebServer\htdocs\bookshelf\storage\framework\views\a75889706a2fa4a029359f85b63afbdb.php:2 Stack trace: #0 {main} thrown in C:\WebServer\htdocs\bookshelf\storage\framework\views\a75889706a2fa4a029359f85b63afbdb.php on line 2