Error : E_NOTICE

Trying to access array offset on value of type null

1
/kunden/431424_13355/webseiten/subdomains/app2019.daga-tagung.de/memyc/core/templatemanager/controller/Controller.php, line 38
35.             $this->oRequest = $oRequest;
36.             $this->oResponse = $oResponse;
37.             $this->oRegistry = \memyc\resources\Registry::getInstance();
38.             $this->sPath = $this->oRegistry->EXTENSIONS[ 'memyc\core\templatemanager'][ 'relativePath'];
39.         }
40. 
41.         /**