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Failed to start GKE cluster (Google Container Engine) with custom network

I am trying to start a GKE cluster with a "custom" type network compared to an "auto" type network.

I use the following command to start my cluster:

$ gcloud container clusters create --cluster-ipv4-cidr=10.0.0.0/14 --network=ttest --subnetwork=ttest --num-nodes=1 jt

I get the following error:

Creating cluster jt...done.
ERROR: (gcloud.container.clusters.create) Operation [<Operation
 name: u'operation-1467037655793-e319dc5e'
 operationType: OperationTypeValueValuesEnum(CREATE_CLUSTER, 1)
 selfLink: u'https://container.googleapis.com/v1/projects/TRUNCATED/zones/us-east1-b/operations/operation-1467037655793-e319dc5e'
 status: StatusValueValuesEnum(DONE, 3)
 statusMessage: u'Requested CIDR 10.0.0.0/14 is not available in network "ttest".'
 targetLink: u'https://container.googleapis.com/v1/projects/TRUNCATED/zones/us-east1-b/clusters/jt'
 zone: u'us-east1-b'>] finished with error: Requested CIDR 10.0.0.0/14 is not available in network "ttest".

It seems like a network or subnet with a range of addresses is required /14, so the team should work perfectly, but it is not.

This is very strange because this is what my networks look like:

Ttest network:

$ gcloud compute networks describe ttest

autoCreateSubnetworks: false
creationTimestamp: '2016-06-27T07:25:03.691-07:00'
id: '5404409453117999568'
kind: compute#network
name: ttest
selfLink: https://www.googleapis.com/compute/v1/projects/myproject/global/networks/ttest
subnetworks:
- https://www.googleapis.com/compute/v1/projects/myproject/regions/us-east1/subnetworks/ttest
x_gcloud_mode: custom

Ttest subnet:

$ gcloud compute networks subnets describe ttest

creationTimestamp: '2016-06-27T07:25:21.649-07:00'
gatewayAddress: 10.0.0.1
id: '6237639993374575038'
ipCidrRange: 10.0.0.0/14
kind: compute#subnetwork
name: ttest
network: https://www.googleapis.com/compute/v1/projects/myproject/global/networks/ttest
region: https://www.googleapis.com/compute/v1/projects/myproject/regions/us-east1
selfLink: https://www.googleapis.com/compute/v1/projects/myproject/regions/us-east1/subnetworks/ttest

I tried the same thing with a manually created old network with --range=10.0.0.0/8, and then tried to create a cluster on that network that also does not work.

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