我在xampp服务器上面临文件夹权限

I am facing folder permission problem in my xampp server. when i am running laravel command php artisan route:list. then i am getting error

[ErrorException]
 Key file "file://G:\Local Server\xampp\htdocs\Examples\example 
 1\laravel\storage\oauth-private.key" permissions are not correct, should be 
 600 or 660 instead of 666.