AWS CIDR is not within the CIDR ranges of VPC

Right now i have a public subnet : CIDR 10.0.0.0/24 I want to add a new subnet on my current vpc to be able to use RDS service.

When i try to add a new subnet with CIDR, i got this message :

10.0.1.0/24 CIDR is not within the CIDR ranges of VPC

My current VPC is 10.0.0.0/24

Any help ?

AWS is correct.

10.0.0.0/24 is 10.0.0.0 to 10.0.0.255. You're trying to add something outside this range, 10.0.1.x

You probably meant to create your VPC as 10.0.0.0/16.

VPC CIDR should be 10.0.0.0/16. Public Subnet and private subnets CIDR should match with 2 bytes of VPC CIDR i.e 10.0.6.0/24 ; 10.0.24.0/24