Creation error RiverFs ElasticSearch

Error RiverFs ElasticSearch

[2012-07-03 16:40:01,035][INFO ][cluster.metadata         ] [Power Man] [_river] update_mapping [mydocs] (dynamic)
[2012-07-03 16:40:01,063][WARN ][river                    ] [Power Man] failed to create river [fs][mydocs]
org.elasticsearch.common.inject.CreationException: Guice creation errors:

1) Error injecting constructor, java.lang.NullPointerException
  at org.elasticsearch.river.fs.FsRiver.<init>(Unknown Source)
  while locating org.elasticsearch.river.fs.FsRiver
  while locating org.elasticsearch.river.River

1 error
        at org.elasticsearch.common.inject.internal.Errors.throwCreationExceptionIfErrorsExist(Errors.java:343)
        at org.elasticsearch.common.inject.InjectorBuilder.injectDynamically(InjectorBuilder.java:178)
        at org.elasticsearch.common.inject.InjectorBuilder.build(InjectorBuilder.java:110)
        at org.elasticsearch.common.inject.InjectorImpl.createChildInjector(InjectorImpl.java:129)
        at org.elasticsearch.common.inject.ModulesBuilder.createChildInjector(ModulesBuilder.java:66)
        at org.elasticsearch.river.RiversService.createRiver(RiversService.java:138)
        at org.elasticsearch.river.RiversService$ApplyRivers$2.onResponse(RiversService.java:270)
        at org.elasticsearch.river.RiversService$ApplyRivers$2.onResponse(RiversService.java:264)
        at org.elasticsearch.action.support.TransportAction$ThreadedActionListener$1.run(TransportAction.java:86)
        at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
        at java.lang.Thread.run(Thread.java:662)
Caused by: java.lang.NullPointerException
        at org.elasticsearch.river.fs.FsRiver.<init>(FsRiver.java:93)
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
        at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
        at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
        at org.elasticsearch.common.inject.DefaultConstructionProxyFactory$1.newInstance(DefaultConstructionProxyFactory.java:54)
        at org.elasticsearch.common.inject.ConstructorInjector.construct(ConstructorInjector.java:86)
        at org.elasticsearch.common.inject.ConstructorBindingImpl$Factory.get(ConstructorBindingImpl.java:98)
        at org.elasticsearch.common.inject.FactoryProxy.get(FactoryProxy.java:52)
        at org.elasticsearch.common.inject.ProviderToInternalFactoryAdapter$1.call(ProviderToInternalFactoryAdapter.java:45)
        at org.elasticsearch.common.inject.InjectorImpl.callInContext(InjectorImpl.java:819)
        at org.elasticsearch.common.inject.ProviderToInternalFactoryAdapter.get(ProviderToInternalFactoryAdapter.java:42)
        at org.elasticsearch.common.inject.Scopes$1$1.get(Scopes.java:56)
        at org.elasticsearch.common.inject.InternalFactoryToProviderAdapter.get(InternalFactoryToProviderAdapter.java:45)
        at org.elasticsearch.common.inject.InjectorBuilder$1.call(InjectorBuilder.java:200)
        at org.elasticsearch.common.inject.InjectorBuilder$1.call(InjectorBuilder.java:193)
        at org.elasticsearch.common.inject.InjectorImpl.callInContext(InjectorImpl.java:812)
        at org.elasticsearch.common.inject.InjectorBuilder.loadEagerSingletons(InjectorBuilder.java:193)
        at org.elasticsearch.common.inject.InjectorBuilder.injectDynamically(InjectorBuilder.java:175)
        ... 10 more