通过ETL创建数据库后，“没有为分区配置节点”

Question

我刚刚使用以下ETL配置创建了一个自定义数据库，

{
  "source": { "file": { "path": "./mydata.csv" } },
  "extractor": { "row": {} },
  "transformers": [
    { "csv": {} },
    { "vertex": { "class": "MyClass" } }
  ],
  "loader": {
    "orientdb": {
       "dbURL": "plocal:/opt/orientdb/databases/MyData",
       "dbUser": "root",
       "dbPassword": "qrefhiuqwriouhwqv",
       "dbType": "graph",
       "classes": [
         {"name": "MyClass", "extends": "V"},
       ]
    }
  }
}

现在，当我进入Web控制台时，我可以看到我在数据库MyData中创建了433k类型的MyClass记录。

当我尝试使用＆＃34进行查询时;从MyClass＆＃34;中选择，我收到错误

2015-04-06 23:56:25:541 SEVERE Internal server error:
com.orientechnologies.orient.server.distributed.ODistributedException: 
No nodes configured for partition 'MyClass.[]' request: 
id=-1 from=node1428362873334 task=command_sql(select from MyClass) userName= [ONetworkProtocolHttpDb]

我做错了什么？