Blank page or "500 Server Error"

1. Open storage/logs/laravel.log in the product folder; the last lines show the real error.
2. Make sure the storage and bootstrap/cache folders are writable by the web server.
3. Check that your PHP version meets the requirements.
4. If you just updated, make sure all files were uploaded and that vendor was replaced too.

Send us the last error lines from the log if you need help.