Slim Application Error

The application could not run because of the following error:

Details

Type: Error
Message: Call to a member function __setSoapHeaders() on null
File: /home/lpk/a/alto/ala-i-tomek/src/Logic/XkomApi/XkomApi.php
Line: 45

Trace

#0 /home/lpk/a/alto/ala-i-tomek/src/Logic/XkomApi/XkomApi.php(39): App\Logic\XkomApi\XkomApi->login()
#1 /home/lpk/a/alto/ala-i-tomek/src/Logic/XkomApi/ProductsApi.php(31): App\Logic\XkomApi\XkomApi->checkConnection()
#2 /home/lpk/a/alto/ala-i-tomek/src/Controller/AlaITomekController.php(84): App\Logic\XkomApi\ProductsApi->getProductsByIds()
#3 /home/lpk/a/alto/ala-i-tomek/src/Controller/AlaITomekController.php(56): App\Controller\AlaITomekController->getProducts()
#4 /home/lpk/a/alto/ala-i-tomek/public/index.php(77): App\Controller\AlaITomekController->showChapter()
#5 [internal function]: Closure->{closure}()
#6 /home/lpk/a/alto/ala-i-tomek/vendor/slim/slim/Slim/Handlers/Strategies/RequestResponse.php(41): call_user_func()
#7 /home/lpk/a/alto/ala-i-tomek/vendor/slim/slim/Slim/Route.php(335): Slim\Handlers\Strategies\RequestResponse->__invoke()
#8 /home/lpk/a/alto/ala-i-tomek/vendor/slim/slim/Slim/MiddlewareAwareTrait.php(117): Slim\Route->__invoke()
#9 /home/lpk/a/alto/ala-i-tomek/vendor/slim/slim/Slim/Route.php(313): Slim\Route->callMiddlewareStack()
#10 /home/lpk/a/alto/ala-i-tomek/vendor/slim/slim/Slim/App.php(495): Slim\Route->run()
#11 /home/lpk/a/alto/ala-i-tomek/vendor/slim/slim/Slim/MiddlewareAwareTrait.php(117): Slim\App->__invoke()
#12 /home/lpk/a/alto/ala-i-tomek/vendor/slim/slim/Slim/App.php(388): Slim\App->callMiddlewareStack()
#13 /home/lpk/a/alto/ala-i-tomek/vendor/slim/slim/Slim/App.php(296): Slim\App->process()
#14 /home/lpk/a/alto/ala-i-tomek/public/index.php(80): Slim\App->run()
#15 {main}
{"result":"false","message":"SOAP-ERROR: Parsing WSDL: Couldn't load from 'https:\/\/s.piotr.c:[email protected]\/api\/soap\/wsdl\/products.wsdl' : failed to load external entity \"https:\/\/s.piotr.c:[email protected]\/api\/soap\/wsdl\/products.wsdl\"\n"}