"error": "unauthorized_client", "error_description": "Unauthorized"

Hello, i'm trying to execute GetCampaigns.php from the google ads api tutorial but i get "error": "unauthorized_client", "error_description": "Unauthorized". -- -- =~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~ Also find us on our blog: https://googleadsdeveloper.blogspot.com/ =~=~=~=~=~=~

"error": "unauthorized_client", "error_description": "Unauthorized"

Hello, i'm trying to execute GetCampaigns.php from the google ads api tutorial but i get "error": "unauthorized_client", "error_description": "Unauthorized". this is my log: Fatal error: Uncaught GuzzleHttp\Exception\ClientException: Client error: `POST https://oauth2.googleapis.com/token` re