Intellij의 Scala 응용 프로그램에서 '오류 : 주 클래스를 찾거나로드 할 수 없음'을 수정하는 방법?

간단한 스칼라 애플리케이션 인 페이지 순위를 만들려고했지만 실행할 수 없습니다.

코드를 얻은 소스 : https://github.com/abbas-taher/pagerank-example-spark2.0-deep-dive

Intellij에서 com.scalaproj 패키지 인 새 scala 프로젝트를 만들고 소스의 코드를 scala 개체 인 SparkPageRank에 추가했습니다. 튜토리얼에서 언급했듯이 spark-2.1.0-bin-hadoop2.7에 대한 외부 jar도 추가했습니다.

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

// scalastyle:off println
package com.scalaproj

import org.apache.spark.sql.SparkSession

/**
 * Computes the PageRank of URLs from an input file. Input file should
 * be in format of:
 * URL         neighbor URL
 * URL         neighbor URL
 * URL         neighbor URL
 * ...
 * where URL and their neighbors are separated by space(s).
 *
 * This is an example implementation for learning how to use Spark. For more conventional use,
 * please refer to org.apache.spark.graphx.lib.PageRank
 *
 * Example Usage:
 * {{{
 * bin/run-example SparkPageRank data/mllib/pagerank_data.txt 10
 * }}}
 */
object SparkPageRank {

  def showWarning() {
    System.err.println(
      """WARN: This is a naive implementation of PageRank and is given as an example!
        |Please use the PageRank implementation found in org.apache.spark.graphx.lib.PageRank
        |for more conventional use.
      """.stripMargin)
  }

  def main(args: Array[String]) {
    if (args.length < 1) {
      System.err.println("Usage: SparkPageRank <file> <iter>")
      System.exit(1)
    }

    showWarning()

    val spark = SparkSession
      .builder
      .appName("SparkPageRank")
      .getOrCreate()

    val iters = if (args.length > 1) args(1).toInt else 10
    val lines = spark.read.textFile(args(0)).rdd
    val links = lines.map{ s =>
      val parts = s.split("\\s+")
      (parts(0), parts(1))
    }.distinct().groupByKey().cache()
    var ranks = links.mapValues(v => 1.0)

    for (i <- 1 to iters) {
      val contribs = links.join(ranks).values.flatMap{ case (urls, rank) =>
        val size = urls.size
        urls.map(url => (url, rank / size))
      }
      ranks = contribs.reduceByKey(_ + _).mapValues(0.15 + 0.85 * _)
    }

    val output = ranks.collect()
    output.foreach(tup => println(tup._1 + " has rank: " + tup._2 + "."))

    spark.stop()
  }
}
// scalastyle:on println

오류없이 프로젝트를 빌드했지만 실행하려고하면 다음과 같이 표시됩니다.

Error: Could not find or load main class com.scalaproj.SparkPageRank

이클립스에서도 같은 오류를 시도했습니다. 누군가 나에게 무엇을해야하는지 말해 줄 수 있습니까?

여기에서 내 프로젝트의 폴더 트리를 볼 수 있습니다.