NoClassDefFoundError: org/apache/solr/client/solrj/impl/HttpSolrServer when using elasticsearch-river-solr

Hi, guys,

Do you see the following error after installing elasticsearch-river-solr plugin?

{

_index: _river
_type: solr_river
_id: _status
_version: 2
_score: 1
_source: {
    error: ComputationException[java.lang.NoClassDefFoundError: org/apache/solr/client/solrj/impl/HttpSolrServer]; nested: NoClassDefFoundError[org/apache/solr/client/solrj/impl/HttpSolrServer]; nested: ClassNotFoundException[org.apache.solr.client.solrj.impl.HttpSolrServer];
    node: {
        id: DrXysOwdRfuRFdFt9GELlQ
        name: Asmodeus
        transport_address: inet[/127.0.0.1:9300]
    }
}

}

I double checked solr-solrj-3.6.1.jar is there under elasticsearch-0.20.4/plugins/river-solr and the file contains the class.

Thanks,