SimpleCalendar\plugin_deps\Google_Service_Exception thrown

{ "error": { "code": 400, "message": "API key not valid. Please pass a valid API key.", "errors": [ { "message": "API key not valid. Please pass a valid API key.", "domain": "global", "reason": "badRequest" } ], "status": "INVALID_ARGUMENT", "details": [ { "@type": "type.googleapis.com/google.rpc.ErrorInfo", "reason": "API_KEY_INVALID", "domain": "googleapis.com", "metadata": { "service": "calendar-json.googleapis.com" } } ] } }