after updating the .env file you always need to run this
Code:
cd /var/www/fspbx
php artisan config:cache
If this doesn't help..
Run this command
Code:
tail -f /var/www/fspbx/storage/logs/laravel.log
Then try to reproduce the error again. Post the last error. The log could be long. Make sure to post all lines from the last error.