Slim Application Error

The application could not run because of the following error:

Details

Type: ErrorException
Code: 2
Message: Undefined array key "HTTP_ACCEPT_LANGUAGE"
File: /home/adjwilli/polly-lingual-webapp/controllers/index.php
Line: 1001

Trace

#0 /home/adjwilli/polly-lingual-webapp/controllers/index.php(1001): Slim\Slim::handleErrors(2, &
#039;Undefined array...&
#039;, &
#039;/home/adjwilli/...&
#039;, 1001)
#1 [internal function]: {closure}(Array, Array, 4)
#2 /home/adjwilli/polly-lingual-webapp/vendor/slim/slim/Slim/Route.php(468): call_user_func_array(Object(Closure), Array)
#3 /home/adjwilli/polly-lingual-webapp/vendor/slim/slim/Slim/Slim.php(1355): Slim\Route->dispatch()
#4 /home/adjwilli/polly-lingual-webapp/vendor/slim/slim/Slim/Middleware/Flash.php(85): Slim\Slim->call()
#5 /home/adjwilli/polly-lingual-webapp/vendor/slim/slim/Slim/Middleware/MethodOverride.php(92): Slim\Middleware\Flash->call()
#6 /home/adjwilli/polly-lingual-webapp/vendor/slim/slim/Slim/Middleware/PrettyExceptions.php(67): Slim\Middleware\MethodOverride->call()
#7 /home/adjwilli/polly-lingual-webapp/vendor/slim/slim/Slim/Slim.php(1300): Slim\Middleware\PrettyExceptions->call()
#8 /home/adjwilli/polly-lingual-webapp/controllers/index.php(5952): Slim\Slim->run()
#9 /home/adjwilli/polly-lingual-webapp/htdocs/index.php(38): require(&
#039;/home/adjwilli/...&
#039;)
#10 {main}