Unknown artifact sbtplugin Super safe compiler with scala 2.12 - scalatest

Question

In my sbt project in Scala 2.12 I am using IntelliJ IDEA and want to import scalatest.
In order to install the recommended SuperSafe Community Edition Scala compiler plugin. I followed the instruction here.
My plugin.sbt:
addSbtPlugin("com.artima.supersafe" % "sbtplugin" % "1.1.2")
the error showed by the Intellij import is:
SBT project import
[warn] [FAILED ] com.artima.supersafe#sbtplugin;1.1.2!sbtplugin.jar(src): (0ms)
[warn] ==== typesafe-ivy-releases: tried
[warn] https://repo.typesafe.com/typesafe/ivy-releases/com.artima.supersafe/sbtplugin/scala_2.10/sbt_0.13/1.1.2/srcs/sbtplugin-sources.jar
[warn] ==== sbt-plugin-releases: tried
[warn] https://repo.scala-sbt.org/scalasbt/sbt-plugin-releases/com.artima.supersafe/sbtplugin/scala_2.10/sbt_0.13/1.1.2/srcs/sbtplugin-sources.jar
[warn] ==== local: tried
[warn] /Users/salvob/.ivy2/local/com.artima.supersafe/sbtplugin/scala_2.10/sbt_0.13/1.1.2/srcs/sbtplugin-sources.jar
[warn] ==== public: tried
[warn] https://repo1.maven.org/maven2/com/artima/supersafe/sbtplugin_2.10_0.13/1.1.2/sbtplugin-1.1.2-sources.jar
[warn] ==== Artima Maven Repository: tried
[warn] http://repo.artima.com/releases/com/artima/supersafe/sbtplugin_2.10_0.13/1.1.2/sbtplugin-1.1.2-sources.jar
[warn] ::::::::::::::::::::::::::::::::::::::::::::::
[warn] :: FAILED DOWNLOADS ...
Maybe incompatility with new Scala Version?

Answer 1

Try the following:
When we add the plug-in in projects/build.sbt:
addSbtPlugin("com.artima.supersafe" % "sbtplugin" % "1.1.2")
We must not add the above plug-in anywhere else
Add to ~/.sbt/0.13/global.sbt
resolvers += "Artima Maven Repository" at "http://repo.artima.com/releases"
Do not add this resolver anywhere else
Make sure you have an empty line before and after each of the sbt lines
HTHs