Q:

Symfony 3.3 built-in server error

I'm developping an app under windows 10 + wamp + php 7 + Symfony 3.3 
I'm trying to use the built-in server :
php bin/console server:run
[OK] Server listening on http://127.0.0.1:8000
// Quit the server with CONTROL-C.

And when I go to http://localhost:8000/app_dev.php/ or http://127.0.0.1:8000/app_dev.php
I get this error : 
Warning: Unknown: failed to open stream: No such file or directory in Unknown on line 0 
Fatal error: Unknown: Failed opening required 'C:\wamp\www\myproject\vendor\symfony\symfony\src\Symfony\Bundle\WebServerBundle/Resources/router.php' (include_path='.;C:\php\pear') in Unknown on line 0

Same error under every routes. My routes are correct and works fine outside of the built-in server...
Can you help me with this issue please ?

A:

I had same problem,
Solved by :

Delete symfony folder in vendor
composer update
If you have antivirus (like Avast) disable it before launching web
server
php bin/console server:run

