Null pointer exception when using mounted resources tab to see the operations on mount point

This URL (http://localhost:8080/apidoc/explorer/#)directs me to the page where i am able to see the monted resources tab on main page.

Inside the mounted resources tab when click on the mount point link to see the operations it gives the error as
500 : undefined http://localhost:8080/apidoc/apis/mounts/1

exception at ODL side:
2014-08-07 17:15:09 IST [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.sal.rest.doc.impl.BaseYangSwaggerGenerator$1.compare(BaseYangSwaggerGenerator.java:352)
at org.opendaylight.controller.sal.rest.doc.impl.BaseYangSwaggerGenerator$1.compare(BaseYangSwaggerGenerator.java:347)
at java.util.TreeMap.compare(TreeMap.java:1188)
at java.util.TreeMap.put(TreeMap.java:531)
at java.util.TreeSet.add(TreeSet.java:255)
at org.opendaylight.controller.sal.rest.doc.impl.BaseYangSwaggerGenerator.getSortedModules(BaseYangSwaggerGenerator.java:362)
at org.opendaylight.controller.sal.rest.doc.impl.BaseYangSwaggerGenerator.getResourceListing(BaseYangSwaggerGenerator.java:82)
at org.opendaylight.controller.sal.rest.doc.mountpoints.MountPointSwagger.getResourceList(MountPointSwagger.java:136)
at org.opendaylight.controller.sal.rest.doc.impl.ApiDocServiceImpl.getMountRootDoc(ApiDocServiceImpl.java:111)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
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)

have attached the full logs for the error