Va Rest HTTP Request doesn't work

Hello!
I want to work with Va Rest plugin, although I got error messages when I wanted to play my game. The link (he URL I wanted to call) is this : https://samples.openweathermap.org/data/2.5/forecast?q=München,DE&appid=b6907d289e10d714a6e88b30761fae22
And I got these error messages, but really don’T know why !

Blueprint Runtime Error: “Accessed None trying to read property CallFunc_Array_Get_Item”. Blueprint: ThirdPersonExampleMap Function: Execute Ubergraph Third Person Example Map Graph: EventGraph Node: As Object

Blueprint Runtime Error: “Accessed None trying to read property CallFunc_AsObject_ReturnValue”. Blueprint: ThirdPersonExampleMap Function: Execute Ubergraph Third Person Example Map Graph: EventGraph Node: As Object

Blueprint Runtime Error: “Accessed None trying to read property CallFunc_GetField_ReturnValue”. Blueprint: ThirdPersonExampleMap Function: Execute Ubergraph Third Person Example Map Graph: EventGraph Node: As Object

Blueprint Runtime Error: “Accessed None trying to read property CallFunc_AsObject_ReturnValue_1”. Blueprint: ThirdPersonExampleMap Function: Execute Ubergraph Third Person Example Map Graph: EventGraph Node: Set Actor Scale 3D

Here’s what I’ve created :

Thank you for your help in advance!