Slim Application Error

The application could not run because of the following error:

Details

Type: InvalidArgumentException
Message: Callable must be return a string
File: /home/admitesn/domains/adminwebsites.com/public_html/vendor/lovecoding/content-cache/src/CacheProvider.php
Line: 46

Trace

#0 /home/admitesn/domains/adminwebsites.com/public_html/index.php(606): LoveCoding\ContentCache\CacheProvider->cache()
#1 [internal function]: Closure->{closure}()
#2 /home/admitesn/domains/adminwebsites.com/public_html/vendor/slim/slim/Slim/Handlers/Strategies/RequestResponse.php(40): call_user_func()
#3 /home/admitesn/domains/adminwebsites.com/public_html/vendor/slim/slim/Slim/Route.php(281): Slim\Handlers\Strategies\RequestResponse->__invoke()
#4 /home/admitesn/domains/adminwebsites.com/public_html/vendor/slim/slim/Slim/MiddlewareAwareTrait.php(117): Slim\Route->__invoke()
#5 /home/admitesn/domains/adminwebsites.com/public_html/vendor/slim/slim/Slim/Route.php(268): Slim\Route->callMiddlewareStack()
#6 /home/admitesn/domains/adminwebsites.com/public_html/vendor/slim/slim/Slim/App.php(503): Slim\Route->run()
#7 /home/admitesn/domains/adminwebsites.com/public_html/vendor/bryanjhv/slim-session/src/Slim/Middleware/Session.php(83): Slim\App->__invoke()
#8 [internal function]: Slim\Middleware\Session->__invoke()
#9 /home/admitesn/domains/adminwebsites.com/public_html/vendor/slim/slim/Slim/DeferredCallable.php(57): call_user_func_array()
#10 [internal function]: Slim\DeferredCallable->__invoke()
#11 /home/admitesn/domains/adminwebsites.com/public_html/vendor/slim/slim/Slim/MiddlewareAwareTrait.php(70): call_user_func()
#12 /home/admitesn/domains/adminwebsites.com/public_html/index.php(82): Slim\App->Slim\{closure}()
#13 [internal function]: Closure->{closure}()
#14 /home/admitesn/domains/adminwebsites.com/public_html/vendor/slim/slim/Slim/DeferredCallable.php(57): call_user_func_array()
#15 [internal function]: Slim\DeferredCallable->__invoke()
#16 /home/admitesn/domains/adminwebsites.com/public_html/vendor/slim/slim/Slim/MiddlewareAwareTrait.php(70): call_user_func()
#17 /home/admitesn/domains/adminwebsites.com/public_html/vendor/slim/slim/Slim/MiddlewareAwareTrait.php(117): Slim\App->Slim\{closure}()
#18 /home/admitesn/domains/adminwebsites.com/public_html/vendor/slim/slim/Slim/App.php(392): Slim\App->callMiddlewareStack()
#19 /home/admitesn/domains/adminwebsites.com/public_html/vendor/slim/slim/Slim/App.php(297): Slim\App->process()
#20 /home/admitesn/domains/adminwebsites.com/public_html/index.php(1031): Slim\App->run()
#21 {main}