scala+spark: 创建RDD时，显示类型不匹配，Type mismatch。

    val data:scala.Seq[(Long, (String, String))] = Seq(
          (3L, ("rxin", "student")), (7L, ("jgozal", "postdoc")),
          (5L, ("franklin", "prof")), (2L, ("istoica", "prof"))
    )

    val users:RDD[(VertexId, (String, String))] = sc.parallelize[(Long, (String, String))](
      data
    )

报错如下：

现在还不知道原因是什么

   // 改成scala.List类型就好了
    val data:scala.List[(Long, (String, String))] = List(
          (3L, ("rxin", "student")), (7L, ("jgozal", "postdoc")),
          (5L, ("franklin", "prof")), (2L, ("istoica", "prof"))
    )

    val users:RDD[(VertexId, (String, String))] = sc.parallelize[(Long, (String, String))](
      data
    )