Session email error in PHP OOP

Fatal error: Uncaught ArgumentCountError: Too few arguments to function User::get_by_email(), 0 passed in C:\xampp\htdocs\OOP\classes\user.class.php on line 90 and exactly 1 expected in C:\xampp\htdocs\OOP\classes\user.class.php:162 Stack trace: #0 C:\xampp\htdocs\OOP\classes\user.class.php(90): User->get_by_email() #1 C:\xampp\htdocs\OOP\login.php(6): User->login(Array) #2 {main} thrown in C:\xampp\htdocs\OOP\classes\user.class.php on line 162