RouterApi call don't find namespace field

It is impossible work with router interface because inside the extension is missing the namespace field.
I tried to create a new Router on openstack thorugh jcloud, but when i try to retireve RouterApi with:
>Optional<RouterApi> t = neutronApi.getRouterApi(region);
>routerApi =t.get();
I got an exception: " Exception in thread "main" com.google.common.util.concurrent.UncheckedExecutionException: java.lang.NullPointerException: namespace "

I report here some output to make simplier the understanding and the resolution of the problem:

This is the output of routerApi.get():

" .....
5:39:57.504 [main] DEBUG jclouds.headers - << Content-Length: 3002
15:39:57.505 [main] DEBUG jclouds.wire - << "{"extensions": [

{"alias": "security-group", "updated": "2012-10-05T10:00:00-00:00", "name": "security-group", "links": [], "description": "The security groups extension."}

,

{"alias": "availability_zone", "updated": "2015-01-01T10:00:00-00:00", "name": "Availability Zone", "links": [], "description": "The availability zone extension."}

,

{"alias": "network_availability_zone", "updated": "2015-01-01T10:00:00-00:00", "name": "Network Availability Zone", "links": [], "description": "Availability zone support for network."}

,

{"alias": "net-mtu", "updated": "2015-03-25T10:00:00-00:00", "name": "Network MTU", "links": [], "description": "Provides MTU attribute for a network resource."}

,

{"alias": "auto-allocated-topology", "updated": "2016-01-01T00:00:00-00:00", "name": "Auto Allocated Topology Services", "links": [], "description": "Auto Allocated Topology Services."}

,

{"alias": "provider", "updated": "2012-09-07T10:00:00-00:00", "name": "Provider Network", "links": [], "description": "Expose mapping of virtual networks to physical networks"}

,

{"alias": "binding", "updated": "2014-02-03T10:00:00-00:00", "name": "Port Binding", "links": [], "description": "Expose port bindings of a virtual port to external application"}

,

{"alias": "quotas", "updated": "2012-07-29T10:00:00-00:00", "name": "Quota management support", "links": [], "description": "Expose functions for quotas management per tenant"}

,

{"alias": "agent", "updated": "2013-02-03T10:00:00-00:00", "name": "agent", "links": [], "description": "The agent management extension."}

,

{"alias": "subnet_allocation", "updated": "2015-03-30T10:00:00-00:00", "name": "Subnet Allocation", "links": [], "description": "Enables allocation of subnets from a subnet pool"}

,

{"alias": "dhcp_agent_scheduler", "updated": "2013-02-07T10:00:00-00:00", "name": "DHCP Agent Scheduler", "links": [], "description": "Schedule networks among dhcp agents"}

,

{"alias": "rbac-policies", "updated": "2015-06-17T12:15:12-00:00", "name": "RBAC Policies", "links": [], "description": "Allows creation and modification of policies that control tenant access to resources."}

,

{"alias": "external-net", "updated": "2013-01-14T10:00:00-00:00", "name": "Neutron external network", "links": [], "description": "Adds external network attribute to network resource."}

,

{"alias": "router", "updated": "2012-07-20T10:00:00-00:00", "name": "Neutron L3 Router", "links": [], "description": "Router abstraction for basic L3 forwarding between L2 Neutron networks and access to external networks via a NAT gateway."}

,

{"alias": "extra_dhcp_opt", "updated": "2013-03-17T12:00:00-00:00", "name": "Neutron Extra DHCP opts", "links": [], "description": "Extra options configuration for DHCP. For example PXE boot options to DHCP clients can be specified (e.g. tftp-server, server-ip-address, bootfile-name)"}

,

{"alias": "extraroute", "updated": "2013-02-01T10:00:00-00:00", "name": "Neutron Extra Route", "links": [], "description": "Extra routes configuration for L3 router"}

]}"
Exception in thread "main" com.google.common.util.concurrent.UncheckedExecutionException: java.lang.NullPointerException: namespace
at com.google.common.cache.LocalCache$Segment.get(LocalCache.java:2201)
at com.google.common.cache.LocalCache.get(LocalCache.java:3934)
at com.google.common.cache.LocalCache.getOrLoad(LocalCache.java:3938)
at com.google.common.cache.LocalCache$LocalLoadingCache.get(LocalCache.java:4821)
at com.google.common.cache.LocalCache$LocalLoadingCache.getUnchecked(LocalCache.java:4827)
at org.jclouds.openstack.v2_0.functions.PresentWhenExtensionAnnotationNamespaceEqualsAnyNamespaceInExtensionsSet.apply(PresentWhenExtensionAnnotationNamespaceEqualsAnyNamespaceInExtensionsSet.java:71)
at org.jclouds.openstack.v2_0.functions.PresentWhenExtensionAnnotationNamespaceEqualsAnyNamespaceInExtensionsSet.apply(PresentWhenExtensionAnnotationNamespaceEqualsAnyNamespaceInExtensionsSet.java:45)

....
"

This is the output of neutronApi listExtensions:

".......
16:08:40.674 [main] DEBUG jclouds.wire - << "{"extensions": [

{"alias": "security-group", "updated": "2012-10-05T10:00:00-00:00", "name": "security-group", "links": [], "description": "The security groups extension."}

,

{"alias": "availability_zone", "updated": "2015-01-01T10:00:00-00:00", "name": "Availability Zone", "links": [], "description": "The availability zone extension."}

,

{"alias": "network_availability_zone", "updated": "2015-01-01T10:00:00-00:00", "name": "Network Availability Zone", "links": [], "description": "Availability zone support for network."}

,

{"alias": "net-mtu", "updated": "2015-03-25T10:00:00-00:00", "name": "Network MTU", "links": [], "description": "Provides MTU attribute for a network resource."}

,

{"alias": "auto-allocated-topology", "updated": "2016-01-01T00:00:00-00:00", "name": "Auto Allocated Topology Services", "links": [], "description": "Auto Allocated Topology Services."}

,

{"alias": "provider", "updated": "2012-09-07T10:00:00-00:00", "name": "Provider Network", "links": [], "description": "Expose mapping of virtual networks to physical networks"}

,

{"alias": "binding", "updated": "2014-02-03T10:00:00-00:00", "name": "Port Binding", "links": [], "description": "Expose port bindings of a virtual port to external application"}

,

{"alias": "quotas", "updated": "2012-07-29T10:00:00-00:00", "name": "Quota management support", "links": [], "description": "Expose functions for quotas management per tenant"}

,

{"alias": "agent", "updated": "2013-02-03T10:00:00-00:00", "name": "agent", "links": [], "description": "The agent management extension."}

,

{"alias": "subnet_allocation", "updated": "2015-03-30T10:00:00-00:00", "name": "Subnet Allocation", "links": [], "description": "Enables allocation of subnets from a subnet pool"}

,

{"alias": "dhcp_agent_scheduler", "updated": "2013-02-07T10:00:00-00:00", "name": "DHCP Agent Scheduler", "links": [], "description": "Schedule networks among dhcp agents"}

,

{"alias": "rbac-policies", "updated": "2015-06-17T12:15:12-00:00", "name": "RBAC Policies", "links": [], "description": "Allows creation and modification of policies that control tenant access to resources."}

,

{"alias": "external-net", "updated": "2013-01-14T10:00:00-00:00", "name": "Neutron external network", "links": [], "description": "Adds external network attribute to network resource."}

,

{"alias": "router", "updated": "2012-07-20T10:00:00-00:00", "name": "Neutron L3 Router", "links": [], "description": "Router abstraction for basic L3 forwarding between L2 Neutron networks and access to external networks via a NAT gateway."}

,

{"alias": "extra_dhcp_opt", "updated": "2013-03-17T12:00:00-00:00", "name": "Neutron Extra DHCP opts", "links": [], "description": "Extra options configuration for DHCP. For example PXE boot options to DHCP clients can be specified (e.g. tftp-server, server-ip-address, bootfile-name)"}

,

{"alias": "extraroute", "updated": "2013-02-01T10:00:00-00:00", "name": "Neutron Extra Route", "links": [], "description": "Extra routes configuration for L3 router"}

]}"
Exception in thread "main" java.lang.NullPointerException: namespace
at com.google.common.base.Preconditions.checkNotNull(Preconditions.java:229)
at org.jclouds.openstack.v2_0.domain.Extension.<init>(Extension.java:127)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
...."