Slim Application Error

The application could not run because of the following error:

Details

Type: Solarium\Exception\HttpException
Message: Solr HTTP error: HTTP request failed, Failed to connect to 127.0.0.1 port 8983: Connection refused
File: /var/www/html/knightcolumbia.org/vendor/solarium/solarium/src/Core/Client/Adapter/Curl.php
Line: 171

Trace

#0 /var/www/html/knightcolumbia.org/vendor/solarium/solarium/src/Core/Client/Adapter/Curl.php(64): Solarium\Core\Client\Adapter\Curl->check()
#1 /var/www/html/knightcolumbia.org/vendor/solarium/solarium/src/Core/Client/Adapter/Curl.php(198): Solarium\Core\Client\Adapter\Curl->getResponse()
#2 /var/www/html/knightcolumbia.org/vendor/solarium/solarium/src/Core/Client/Adapter/Curl.php(41): Solarium\Core\Client\Adapter\Curl->getData()
#3 /var/www/html/knightcolumbia.org/vendor/solarium/solarium/src/Core/Client/Client.php(846): Solarium\Core\Client\Adapter\Curl->execute()
#4 /var/www/html/knightcolumbia.org/vendor/solarium/solarium/src/Core/Client/Client.php(817): Solarium\Core\Client\Client->executeRequest()
#5 /var/www/html/knightcolumbia.org/vendor/solarium/solarium/src/Core/Client/Client.php(922): Solarium\Core\Client\Client->execute()
#6 /var/www/html/knightcolumbia.org/app/site/routes/reading_room.php(185): Solarium\Core\Client\Client->select()
#7 [internal function]: Closure->{closure}()
#8 /var/www/html/knightcolumbia.org/vendor/slim/slim/Slim/Handlers/Strategies/RequestResponse.php(41): call_user_func()
#9 /var/www/html/knightcolumbia.org/vendor/slim/slim/Slim/Route.php(344): Slim\Handlers\Strategies\RequestResponse->__invoke()
#10 /var/www/html/knightcolumbia.org/vendor/slim/slim/Slim/MiddlewareAwareTrait.php(122): Slim\Route->__invoke()
#11 /var/www/html/knightcolumbia.org/vendor/slim/slim/Slim/Route.php(316): Slim\Route->callMiddlewareStack()
#12 /var/www/html/knightcolumbia.org/vendor/slim/slim/Slim/App.php(476): Slim\Route->run()
#13 /var/www/html/knightcolumbia.org/vendor/akrabat/rka-ip-address-middleware/src/IpAddress.php(92): Slim\App->__invoke()
#14 [internal function]: RKA\Middleware\IpAddress->__invoke()
#15 /var/www/html/knightcolumbia.org/vendor/slim/slim/Slim/DeferredCallable.php(43): call_user_func_array()
#16 [internal function]: Slim\DeferredCallable->__invoke()
#17 /var/www/html/knightcolumbia.org/vendor/slim/slim/Slim/MiddlewareAwareTrait.php(73): call_user_func()
#18 /var/www/html/knightcolumbia.org/vendor/slim/slim/Slim/MiddlewareAwareTrait.php(122): Slim\App->Slim\{closure}()
#19 /var/www/html/knightcolumbia.org/vendor/slim/slim/Slim/App.php(370): Slim\App->callMiddlewareStack()
#20 /var/www/html/knightcolumbia.org/vendor/slim/slim/Slim/App.php(295): Slim\App->process()
#21 /var/www/html/knightcolumbia.org/public/site/index.php(66): Slim\App->run()
#22 {main}