The stream or file "/opt/lampp/htdocs/intro/storage/logs/laravel.log" could not be opened in append mode: Failed to open stream: Permission denied 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: could not be opened in append mode

chmod -R 777 storage