laravel could not be opened in append mode: failed to open stream: Permission denied in file postman code example

Example 1: could not be opened in append mode: failed to open stream: Permission denied

chmod -R 775 storage
chmod -R 775 bootstrap/cache

Example 2: laravel.log" could not be opened in append mode

config.vm.synced_folder "./app","/var/www/", create:true,
:owner => "vagrant",
:group => "www-data",
:mount_options => ["dmode=775","fmode=664"]