scala项目编译错误

我要上scala课程。我下载了示例项目，但无法编译它。运行console命令时出现错误

build.sbt：

name := course.value + "-" + assignment.value

scalaVersion := "2.12.4"

scalacOptions ++= Seq("-deprecation")

// grading libraries
libraryDependencies += "junit" % "junit" % "4.10" % Test

// for funsets
libraryDependencies += "org.scala-lang.modules" %% "scala-parser-combinators" % "1.0.4"

resolvers += "Artima Maven Repository" at "http://repo.artima.com/releases"

// include the common dir
commonSourcePackages += "common"

courseId := "bRPXgjY9EeW6RApRXdjJPw"

错误：

> console
[info] Updating root
[info] Resolved root dependencies
[trace] Stack trace suppressed: run last *:coursierResolution for the full output.
[error] (*:coursierResolution) coursier.ResolutionException: Encountered 1 error(s) in dependency resolution:
[error]   org.scalatest:scalatest_2.12:2.2.4:
[error]     not found:
[error]       /Users/joaonobre/.ivy2/local/org.scalatest/scalatest_2.12/2.2.4/ivys/ivy.xml
[error]       /Users/joaonobre/.sbt/preloaded/org.scalatest/scalatest_2.12/2.2.4/ivys/ivy.xml
[error]       /Users/joaonobre/.sbt/preloaded/org/scalatest/scalatest_2.12/2.2.4/scalatest_2.12-2.2.4.pom
[error]       https://repo1.maven.org/maven2/org/scalatest/scalatest_2.12/2.2.4/scalatest_2.12-2.2.4.pom
[error]       http://repo.artima.com/releases/org/scalatest/scalatest_2.12/2.2.4/scalatest_2.12-2.2.4.pom
[error] Total time: 1 s, completed Dec 22, 2017 4:16:17 PM

scala -version
Scala code runner version 2.12.4 -- Copyright 2002-2017, LAMP/EPFL and Lightbend, Inc.

知道怎么修吗

---

谢谢。

正如@laughedelic所建议的，Scala 2.12没有scalatest-2.2.4。因此，sbt找不到相关的scalatest pom文件。您可以选择提到的任何版本

例如，尝试在CommonBuild.scala文件中将scalaTestDependency版本更改为3.0.5

lazy val scalaTestDependency = "org.scalatest" %% "scalatest" % "3.0.5"

---

这是本课程（第一周的实践编程作业）

您确定本课程使用Scala 2.12吗？错误告诉您，它无法解析Scala 2.12对scalatest-2.2.4的依赖关系（可能是因为只有scalatest-3.+可用于2.12）。同时您正在使用junit。因此，请提供课程的链接，然后我可以检查与官方设置说明的区别。