Cannot resolve plugin org.scala-toolsmaven-scala-plugin unknown
使用maven下载IDEA的 maven-scala-plugin 时报如下4个错误：Cannot resolve plugin org.scala-tools:maven-scala-plugin:Could not find artifact org.scala-lang:scala-compiler:pom:2.11.12 in scala-tools.org (http://scala-tools.org/repo-releases)Could not find artifact org
