I didn't change any backend code .I dont know it triggers when I hit any url of laravel app it will show this error.I dont know why this happend and also need solution for this .My laravel version in 5.8 and php 7.2
 Fatal error : Class Illuminate\Routing\RouteCollection contains 1 abstract method and must therefore be declared abstract or implement the remaining methods C:\xampp\htdocs\pmf\vendor\laravel\framework\src\Illuminate\Routing\RouteCollection.php on line 14 this is file it is saying.