我正在尝试在服装VPC中创建Postgresql RDS。当我尝试将可公开访问的修改为"YES“ 我得到下面的错误: Cannot create a publicly accessible DBInstance. The specified VPC does not support DNS resolution, DNS hostnames, or both. Update the VPC and then try again (Service: AmazonRDS; Status Code: 400; Error Code: InvalidVPCNetworkStateFault;