我不熟悉apache flink和gelly，我使用scalaapi。我有一个顶点数据集和一个边数据集，我试图创建这样一个图：

val env = ExecutionEnvironment.getExecutionEnvironment
// correct result
val edges: DataSet[Edge[Long, Long]] = (some transformations here)
//also correct result
val vertices: DataSet[Vertex[Long, String]] = (some transformations here)
//in the line below I get the errors
val graph = Graph.fromDataSet(vertices, edges, env)

我得到以下错误：

Type mismatch,expected: 
  DataSet[Vertex[NotInferedK,NotInferedVV]], actual: DataSet[Vertex[Long,String]]

Type mismatch,expected: 
  DataSet[Edges[NotInferedK,NotInferedEV]], actual: DataSet[Edge[Long,Long]]

Type mismatch,expected: 
  org.apache.flink.api.java.ExecutionEnvironment, actual: org.apache.flink.api.scala.ExecutionEnvironment