java.lang.NullPointerException when creating instances in Devstack

Creating 20 VMs using "num-instances" in nova creates the following errors....

Stack trace....

2014-01-17 16:05:45 GMT [com.sun.jersey.spi.container.ContainerResponse] SEVERE com.sun.jersey.spi.container.ContainerResponse mapMappableContainerException The RuntimeException could not be mapped to a response, re-throwing to the HTTP container
java.lang.NullPointerException
at org.opendaylight.controller.networkconfig.neutron.NeutronSubnet_IPAllocationPool.convert(NeutronSubnet_IPAllocationPool.java:81)
at org.opendaylight.controller.networkconfig.neutron.NeutronSubnet_IPAllocationPool.contains(NeutronSubnet_IPAllocationPool.java:65)
at org.opendaylight.controller.networkconfig.neutron.NeutronSubnet.allocateIP(NeutronSubnet.java:369)
at org.opendaylight.controller.networkconfig.neutron.implementation.NeutronPortInterface.addPort(NeutronPortInterface.java:234)
at org.opendaylight.controller.networkconfig.neutron.northbound.NeutronPortsNorthbound.createPorts(NeutronPortsNorthbound.java:355)
at sun.reflect.GeneratedMethodAccessor267.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at com.sun.jersey.spi.container.JavaMethodInvokerFactory$1.invoke(JavaMethodInvokerFactory.java:60)
at com.sun.jersey.server.impl.model.method.dispatch.AbstractResourceMethodDispatchProvider$ResponseOutInvoker._dispatch(AbstractResourceMethodDispatchProvider.java:205)
at com.sun.jersey.server.impl.model.method.dispatch.ResourceJavaMethodDispatcher.dispatch(ResourceJavaMethodDispatcher.java:75)
at com.sun.jersey.server.impl.uri.rules.HttpMethodRule.accept(HttpMethodRule.java:302)
at com.sun.jersey.server.impl.uri.rules.ResourceClassRule.accept(ResourceClassRule.java:108)
at com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:147)
at com.sun.jersey.server.impl.uri.rules.RootResourceClassesRule.accept(RootResourceClassesRule.java:84)
at com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1511)
at com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1442)
at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1391)
at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1381)
at com.sun.jersey.spi.container.servlet.WebComponent.service(WebComponent.java:416)
at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:538)
at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:716)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:848)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:581)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:929)
at org.apache.catalina.authenticator.SingleSignOn.invoke(SingleSignOn.java:309)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1002)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:585)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:724)

Steps to reproduce:

From devstack controller....

./openrc admin admin
nova keypair-add --pub-key ~/.ssh/id_rsa.pub mykey
nova quota-update --instances 100 --cores 200 --ram 5120000 admin
neutron net-create my-private-net
neutron subnet-create $(neutron net-list | grep 'my-private-net' | awk '

{print $2}') 10.254.0.0/24 --name my-private-subnet --ip-version 4 --gateway 10.254.0.1 --allocation-pool start=10.254.0.2,end=10.254.0.254

nova boot --flavor m1.nano --image $(nova image-list | grep 'cirros-0.3.1-x86_64-uec\s' | awk '{print $2}

') --nic net-id=$(neutron net-list | grep my-private-net | awk '

{print $2}

') --key-name mykey --num-instances 20 test