500 Internal Server Error

Undefined variable: model (8)

#0 /var/www/br.com.secretspace.web/html/app/controllers/Auth.php(660): flight\Engine->handleError()
#1 /var/www/br.com.secretspace.web/html/app/routes/inc/auth.php(32): Auth->twitter()
#2 /var/www/br.com.secretspace.web/html/vendor/mikecao/flight/flight/core/Dispatcher.php(167): {closure}()
#3 /var/www/br.com.secretspace.web/html/vendor/mikecao/flight/flight/core/Dispatcher.php(145): flight\core\Dispatcher::callFunction()
#4 /var/www/br.com.secretspace.web/html/vendor/mikecao/flight/flight/Engine.php(342): flight\core\Dispatcher::execute()
#5 /var/www/br.com.secretspace.web/html/vendor/mikecao/flight/flight/core/Dispatcher.php(198): flight\Engine->_start()
#6 /var/www/br.com.secretspace.web/html/vendor/mikecao/flight/flight/core/Dispatcher.php(144): flight\core\Dispatcher::invokeMethod()
#7 /var/www/br.com.secretspace.web/html/vendor/mikecao/flight/flight/core/Dispatcher.php(49): flight\core\Dispatcher::execute()
#8 /var/www/br.com.secretspace.web/html/vendor/mikecao/flight/flight/Engine.php(92): flight\core\Dispatcher->run()
#9 /var/www/br.com.secretspace.web/html/vendor/mikecao/flight/flight/core/Dispatcher.php(198): flight\Engine->__call()
#10 /var/www/br.com.secretspace.web/html/vendor/mikecao/flight/flight/Flight.php(77): flight\core\Dispatcher::invokeMethod()
#11 /var/www/br.com.secretspace.web/html/app/index.php(12): Flight::__callStatic()
#12 /var/www/br.com.secretspace.web/html/index.php(15): require('/var/www/br.com...')
#13 {main}