creating subnet in zone: ap-northeast-1b failed (region=Tokyo)

[schrht]

[cheshi@cheshi-laptop2 aws-test-init]$ ./config_vpc.sh
Thu Nov 2 10:54:43 CST 2017
creating vpc with CIDR block: 10.32.0.0/16
new vpc created, resource-id = vpc-d225c0b5.
tag created for this resource.
enabled dns support for this vpc.
enabled dns hostnames for this vpc.
new igw created, resource-id = igw-68ff4a0c.
tag created for this resource.
attached igw to the vpc.
creating subnet in zone: ap-northeast-1a
new subnet created, resource-id = subnet-5eae1017.
tag created for this resource.
configured auto assign public IP.
configured auto assign IPv6 address.
creating subnet in zone: ap-northeast-1b

An error occurred (InvalidParameterValue) when calling the CreateSubnet operation: Value (ap-northeast-1b) for parameter availabilityZone is invalid. Subnets can currently only be created in the following availability zones: ap-northeast-1a, ap-northeast-1c.
./config_vpc.sh: line 207: "aws ec2 create-subnet" failed.
[cheshi@cheshi-laptop2 aws-test-init]$

[schrht]

Continue creating subnet in other zones if available.