Slim Application Error

The application could not run because of the following error:

Details

Type: ErrorException
Code: 8
Message: Undefined index: site
File: /mnt/nfs1/data0/sv3.biz/vhosts/cd-sites-mb-system/app/index.php
Line: 169

Trace

#0 /mnt/nfs1/data0/sv3.biz/vhosts/cd-sites-mb-system/app/index.php(169): Slim\Slim::handleErrors(8, 'Undefined index...', '/mnt/nfs1/data0...', 169, Array)
#1 [internal function]: {closure}()
#2 /mnt/nfs1/data0/sv3.biz/vhosts/cd-sites-mb-system/vendor/slim/slim/Slim/Route.php(468): call_user_func_array(Object(Closure), Array)
#3 /mnt/nfs1/data0/sv3.biz/vhosts/cd-sites-mb-system/vendor/slim/slim/Slim/Slim.php(1355): Slim\Route->dispatch()
#4 /mnt/nfs1/data0/sv3.biz/vhosts/cd-sites-mb-system/vendor/slim/slim/Slim/Middleware/Flash.php(85): Slim\Slim->call()
#5 /mnt/nfs1/data0/sv3.biz/vhosts/cd-sites-mb-system/vendor/slim/slim/Slim/Middleware/MethodOverride.php(92): Slim\Middleware\Flash->call()
#6 /mnt/nfs1/data0/sv3.biz/vhosts/cd-sites-mb-system/vendor/slim/slim/Slim/Middleware/PrettyExceptions.php(67): Slim\Middleware\MethodOverride->call()
#7 /mnt/nfs1/data0/sv3.biz/vhosts/cd-sites-mb-system/vendor/slim/slim/Slim/Slim.php(1300): Slim\Middleware\PrettyExceptions->call()
#8 /mnt/nfs1/data0/sv3.biz/vhosts/cd-sites-mb-system/app/index.php(196): Slim\Slim->run()
#9 /mnt/nfs1/data0/sv3.biz/vhosts/cd-sites-mb-system/public/index.php(3): require('/mnt/nfs1/data0...')
#10 {main}