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Error: creating EC2 Subnet: InvalidSubnet.Conflict: The CIDR '10.0.102.0/24' conflicts with another subnet status code: 400, request id: d24db4d9-d13d-44e3-b741-b4af409fc7d7
with module.blog_vpc.aws_subnet.public[1]
on .terraform/modules/blog_vpc/main.tf line 97, in resource "aws_subnet" "public":
resource "aws_subnet" "public" {

Error: Error in function call
on .terraform/modules/blog_vpc/main.tf line 1087, in resource "aws_route" "private_nat_gateway":
  route_table_id         = element(aws_route_table.private[*].id, count.index)
while calling element(list, index)
aws_route_table.private is empty tuple
count.index is [NB: terraform returns 3 errors, all with the same trace except here, where count.index ranges between 0 and 2.] 
Call to function "element" failed: cannot use element function with an empty list.