When Show this type of error then may be below line missing in your “config/app.php“


So, Add this line in your Config/App.php ” ‘aliases’
Add This
// To enable debugging
<strong> 'Debugbar' => Barryvdh\Debugbar\Facade::class,</strong>
Code language: PHP (php)

After that showing this type of error then update composer like below command
“composer update“

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