Gateway address and subnet mask have to be provided...

I am trying to get this script working for creating an OrgNetwork in vCD 5.1.  When I run it I get an exception saying that "Gateway address and subnet mask have to be provided when creating routed/isolated org VDC network."  Here is what I have, this is a modified version of a vApp network creation script that Jake Robinson wrote:

$orgName = "1001"

$org = Get-OrgVdc $orgName | Get-CIView

$mynetwork = new-object vmware.vimautomation.cloud.views.orgvdcnetwork

$mynetwork.Name = "1001-Test"

$mynetwork.configuration = new-object vmware.vimautomation.cloud.views.networkconfiguration

$mynetwork.configuration.fencemode = "natRouted"

$mynetwork.Configuration.IpScope = new-object vmware.vimautomation.cloud.views.ipscope

$mynetwork.Configuration.IpScope.Gateway = "192.168.2.1"

$mynetwork.Configuration.IpScope.Netmask = "255.255.255.0"

$mynetwork.Configuration.IpScope.Dns1 = "192.168.2.1"

$mynetwork.Configuration.IpScope.IpRanges = new-object vmware.vimautomation.cloud.views.ipranges

$mynetwork.Configuration.IpScope.IpRanges.IpRange = new-object vmware.vimautomation.cloud.views.iprange

$mynetwork.Configuration.IpScope.IpRanges.IpRange[0].startaddress = "192.168.2.100"

$mynetwork.Configuration.IpScope.IpRanges.IpRange[0].endaddress = "192.168.2.200"

$result = $org.CreateNetwork($mynetwork)

Any help would be greatly appreciated.  Thanks in advance!