[SOLVED] Problem with custom library.

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PHP Fatal error:  Uncaught Error: Call to a member function model() on null in.............

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[30-Aug-2024 00:12:01 America/New_York] PHP Fatal error:  Uncaught Error: Call to a member function model() on null in ............../system/library/library_file.php:48
Stack trace:
#0 ............../catalog/controller/account/login.php(259): Guardian_SRH->tracking('', '', 'Account Login')
#1 ............../catalog/controller/account/login.php(108): ControllerAccountLogin->validate()
#2 ............../system/engine/action.php(79): ControllerAccountLogin->index()
#3 ............../catalog/controller/startup/router.php(25): Action->execute(Object(Registry))
#4 ............../system/engine/action.php(79): ControllerStartupRouter->index()
#5 ............../system/engine/router.php(77): Action->execute(Object(Registry))
#6 ............../system/engine/router.php(66): Router->execute(Object(Action))
#7 ............../system/framework.php(169): Router->dispatch(Object(Action), Object(Action))
#8 ............../system/startup.php(104): require_once('/home/user/...')
#9 ............../index.php(19): start('catalog')
#10 {main}
  thrown in ............../system/library/guardian_srh.php on line 48

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public class LibraryFile {
    protected $registry;

    public function __construct($registry) {
        $this->registry = $registry;
    }

    public function __get($key) {
        return $this->registry->get($key);
    }

    public function __set($key, $value) {
        $this->registry->set($key, $value);
    }
    ....
}

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		public function __construct($registry) {
			$this->config = $registry->get('config');
			$this->db = $registry->get('db');
			$this->request = $registry->get('request');
			$this->session = $registry->get('session');
			$this->log = $registry->get('log');
		}

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class LibraryFile {

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public class LibraryFile {

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class LibraryFile {

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		private $customer;

		public function __construct($registry) {

			$this->registry = $registry;

			========I tried one of the following==============
			$this->customer = $registry->get('customer');
			$this->customer = $registry->get('cart/customer');
			$this->customer = $registry->get('/cart/customer');

		}

		public function __get($name) {

		   return $this->registry->get($name);

		}
		
		public function something() {
		
			$customer_id = $this->customer->getId();
		
		}

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		// Customer
		$customer = new Cart\Customer($this->registry);
		$this->registry->set('customer', $customer);

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$this->customer = $registry->get('customer');