PHPWarningFramework ErrorMay 16, 2026

Framework Error

Cannot instantiate abstract class App\Controller\Admin\BaseAdminController because "App\Controller\Admin\UserAdminController" contains abstract methods "index" and "show"

What This Error Means

This error occurs when you try to instantiate an abstract class, which is a class that cannot be directly instantiated and must be inherited from. In this case, the error is caused by a child class trying to extend an abstract parent class without implementing its abstract methods.

Why It Happens

This error typically happens when you have a parent class that is declared as abstract, meaning it cannot be instantiated directly. However, a child class is trying to extend this parent class without implementing its abstract methods. This can be due to a misunderstanding of abstract classes or not properly implementing the required methods in the child class.

How to Fix It

  1. 1To fix this error, you need to implement the abstract methods in the child class. You can do this by adding the "abstract" keyword before the method signature in the child class, or by providing an implementation for the method. Here's an example:
  2. 2// Before (broken code)
  3. 3abstract class BaseAdminController extends Controller\AdminController {
  4. 4 public abstract function index();
  5. 5 public abstract function show();
  6. 6}
  7. 7class UserAdminController extends BaseAdminController {
  8. 8 // Missing implementation for index() and show() methods
  9. 9}
  10. 10// After (fixed code)
  11. 11class UserAdminController extends BaseAdminController {
  12. 12 public function index() {
  13. 13 // Implement the index() method here
  14. 14 }
  15. 15 public function show() {
  16. 16 // Implement the show() method here
  17. 17 }
  18. 18}

Example Code Solution

❌ Before (problematic code)
PHP
abstract class BaseAdminController extends Controller\AdminController {
 public abstract function index();
 public abstract function show();
}

class UserAdminController extends BaseAdminController {
 // Missing implementation for index() and show() methods
}
✅ After (fixed code)
PHP
class UserAdminController extends BaseAdminController {
 public function index() {
 // Implement the index() method here
 }
 public function show() {
 // Implement the show() method here
 }
}

Fix for Cannot instantiate abstract class App\Controller\Admin\BaseAdminController because "App\Controller\Admin\UserAdminController" contains abstract methods "index" and "show"

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