could not find implicit value for evidence parameter of type

Error:(34, 26) could not find implicit value for evidence parameter of type org.apache.flink.api.common.typeinfo.TypeInformation[(String, Long, Int)]
val tsDS = dataDS.map(str => {
Error:(34, 26) not enough arguments for method map: (implicit evidence$8: org.apache.flink.api.common.typeinfo.TypeInformation[(String, Long, Int)])org.apache.flink.streaming.api.scala.DataStream[(String, Long, Int)].
Unspecified value parameter evidence$8.
val tsDS = dataDS.map(str => {
/home/appleyuchi/桌面/Flink_Code/水位线实验/src/main/scala/PunctuatedWatermarks.scala
Error:(20, 26) could not find implicit value for evidence parameter of type org.apache.flink.api.common.typeinfo.TypeInformation[(String, Long, Int)]
val tsDS = dataDS.map(str => {
Error:(20, 26) not enough arguments for method map: (implicit evidence$8: org.apache.flink.api.common.typeinfo.TypeInformation[(String, Long, Int)])org.apache.flink.streaming.api.scala.DataStream[(String, Long, Int)].
Unspecified value parameter evidence$8.
val tsDS = dataDS.map(str => {

网上绝大多数博客都说要:

①import org.apache.flink.streaming.api.scala._

然而发现并没有卵用。。。

还需要注意版本，我的版本如下:

sdk2.12.12

could not find implicit value for evidence parameter of type

我的pom.xml版本:

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>org.example</groupId>
    <artifactId>datastream_api</artifactId>
    <version>1.0-SNAPSHOT</version>
    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.1</version>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                </configuration>
            </plugin>
        </plugins>
    </build>


    <dependencies>

        <!-- https://mvnrepository.com/artifact/org.apache.flink/flink-streaming-scala -->
        <dependency>
            <groupId>org.apache.flink</groupId>
            <artifactId>flink-streaming-scala_2.12</artifactId>
            <version>1.11.1</version>
            <!--<scope>provided</scope>-->
        </dependency>

        <dependency>
            <groupId>org.apache.flink</groupId>
            <artifactId>flink-streaming-java_2.12</artifactId>
            <version>1.11.1</version>
            <!--<scope>compile</scope>-->
        </dependency>

        <dependency>
            <groupId>org.apache.flink</groupId>
            <artifactId>flink-clients_2.12</artifactId>
            <version>1.11.1</version>
        </dependency>


        <dependency>
            <groupId>org.apache.flink</groupId>
            <artifactId>flink-core</artifactId>
            <version>1.11.1</version>
        </dependency>

    </dependencies>
</project>

所以这个问题注意同时检查pom.xml和sdk以及①

不要只添加个①哈。

could not find implicit value for evidence parameter of type

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