Flink streaming 程序报错not enough arguments for method addSource: (implicit evidence$9:

运行flink streaming程序报错：
报错信息如下：

Error:(21, 18) not enough arguments for method addSource: (implicit evidence$9: org.apache.flink.api.common.typeinfo.TypeInformation[String])org.apache.flink.streaming.api.scala.DataStream[String].
Unspecified value parameter evidence$9.
    env.addSource(source)

报错原因：
flink的StreamExecutionEnvironment依赖导包错误

正确的是：

import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment

正确依赖是：

<dependency>
     <groupId>org.apache.flink</groupId>
     <artifactId>flink-streaming-java_${scala.version}</artifactId>
     <version>${flink.version}</version>
</dependency>