symfony - Laravel Composer Update Error -

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i having error when using composer update in cmd, stopping me installing new plugins website. 

{"error":{"type":"symfony\\component\\debug\\exception\\fatalerrorexception","me ssage":"class 'illuminate\\validation\\validationextensionserviceprovider' not f ound","file":"c:\\users\\noriel.mercado\\desktop\\xampp\\htdocs\\ofw\\vendor\\la ravel\\framework\\src\\illuminate\\foundation\\providerrepository.php","line":15 7}}script php artisan clear-compiled handling post-update-cmd event returned error

and when run program or view it, laravel returns error.

class 'illuminate\validation\validationextensionserviceprovider' not found

i need help, there there knows how fix it?


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