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Fatal error: Uncaught InvalidArgumentException: $applicationName cannot be null. in /Applications/XAMPP/xamppfiles/htdocs/Project_April/MarketplaceWebService/Client.php:142 Stack trace: #0 /Applications/XAMPP/xamppfiles/htdocs/Project_April/MarketplaceWebService/Client.php(123): MarketplaceWebService_Client->constructUserAgentHeader(NULL, NULL, Array) #1 /Applications/XAMPP/xamppfiles/htdocs/Project_April/MarketplaceWebService/Client.php(101): MarketplaceWebService_Client->setUserAgentHeader(NULL, NULL, Array) #2 /Applications/XAMPP/xamppfiles/htdocs/Project_April/PriceUpdate.php(42): MarketplaceWebService_Client->__construct(NULL, NULL, Array, NULL, NULL) #3 {main} thrown in /Applications/XAMPP/xamppfiles/htdocs/Project_April/MarketplaceWebService/Client.php on line 142