Warning: Unknown: failed to open stream: No such file or directory in Unknown on line 0

Hello guys, I have experience this problem when I ran php artisan serve. After I access the url which is 127.0.0.1:8000, I encounter this:

Fatal error: Unknown: Failed opening required 'C:\xampp\htdocs\focus\server.php' (include_path='C:\xampp\php\PEAR') in Unknown on line 0

I have no idea how to fix this, and I can't see my webpage

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