I am new to Play Framework and Scala and this amazing tool activator.
I am unable to run template projects that run play framework (eg: hello-play-scala) but able to
I was having the same problem on Windows 8.1, and after googling for a solution, I initially tried to update some of my plugins. (It turned out that only sbt-less was a bit out of date.) However, that did not resolve the matter.
So, I found a couple of Web pages that mentioned the same problem, and it seemed that folks who adjusted the number of forward slashes in their ~/.sbt/repositories file (C:/Users/ file on Windows) were able to resolve the matter that way. So, I changed both of the file://// patterns in my ~/.sbt/repositories file to file:///.
Then I stopped my activator, killed all of the lingering instances of Java that it had spawned, deleted my file and restarted activator. Now, things seem to be working.
FYI, here are the two most helpful pages that I found regarding the problem: