Problem:

The import views.html.index cannot be resolved

Solution: 

Add

• target/scala-2.11/routes/main
• _target/scala-2.11/twirl/main _

to your project build path.
For some reason the option bellow wasn’t enough:

• EclipseKeys.createSrc := EclipseCreateSrc.ValueSet(EclipseCreateSrc.ManagedClasses, EclipseCreateSrc.ManagedResources)