using solr indexing exception

[????]

Hi!gays

I run the following command in nutch2.2.1,
bin/nutch crawl urls/ -solr http://localhost:8983/solr -depth 3 -topN 20

Exception in thread "main" java.lang.NullPointerException
at java.util.Hashtable.put(Hashtable.java:394)
at java.util.Properties.setProperty(Properties.java:143)
at org.apache.hadoop.conf.Configuration.set(Configuration.java:438)
at org.apache.nutch.indexer.IndexerJob.createIndexJob(IndexerJob.java:129)
at org.apache.nutch.indexer.solr.SolrIndexerJob.run(SolrIndexerJob.java:44)
at org.apache.nutch.crawl.Crawler.runTool(Crawler.java:69)
at org.apache.nutch.crawl.Crawler.run(Crawler.java:194)
at org.apache.nutch.crawl.Crawler.run(Crawler.java:252)
at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:65)
at org.apache.nutch.crawl.Crawler.main(Crawler.java:261)

the nutch-site.xml file??

<?xml version="1.0"?>

<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>




<!-- Put site-specific property overrides in this file. -->




<configuration>

    <property> 

       <name>http.agent.name</name> 

       <value>test-nutch</value> 

    </property>

    <property> 

       <name>http.robots.agents</name> 

       <value>test-nutch,*</value> 

    </property>

    <property> 

        <name>generate.batch.id</name> 

        <value>1</value> 

    </property>

    <property> 

       <name>http.agent.name.check</name> 

       <value>true</value> 

    </property>

    <property> 

       <name>distributed.search.test.port</name> 

        <value>60000</value> 

    </property>

    <property> 

       <name>http.accept.language</name> 

        <value>ja-jp,en-us,en-gb,en;q=0.7,*;q=0.3</value> 

    </property>

    <property> 

       <name>parser.character.encoding.default</name> 

       <value>utf-8</value>

    </property>

    <property> 

        <name>storage.data.store.class</name> 

       <value>org.apache.gora.hbase.store.HBaseStore</value> 

    </property>

    <property> 

       <name>hadoop.tmp.dir</name> 

       <value>/home/hduser/dirs/hdp_tmp_dir</value> 

    </property>

    <property> 

      <name>plugin.folders</name> 

     <value>/home/hduser/apache-nutch-2.2.1/runtime/local/plugins</value> 

    </property>

</configuration>

I don't know how to fix it.

The source code :
protected Job createIndexJob(Configuration conf, String jobName, String batchId)

127

  throws IOException, ClassNotFoundException {

128

    conf.set(GeneratorJob.BATCH_ID, batchId);


BATCH_ID
 public static final String BATCH_ID = "generate.batch.id";


How to fix it.I need you help!
Thank you !