From Array Suite Wiki

In ArrayServer on Cloud configuration, set subnetID for VPCx.

When this error message is displayed: "Error=There are not enough free addresses in subnet 'subnet-0083ca76' to satisfy the requested number of instances." One possible resolution is to shift the Array Server EC2 instance to another VPC subnet with a wider address space. After making this change, the Array Server admin will need to update this parameter in the ArrayServer.cfg file to contain the new VPC subnet information.