When using Scala-IDE with Eclipse PDE, and set the Scala version to a different one than 2.12, I get the error "More than one scala library found in the build path".
I can go to the Manifest and manually put in there something like:
Require-Bundle: org.scala-lang.scala-library;bundle-version="[2.11.0,2.12.0)"
but then the error does not go away but becomes a warning.
Indeed I have two different jars of Scala 2.11.8 in my .p2/pool/plugins. How do I get rid of one?