Compile pug template in Scala

Question

I am using Scalate in my project. I am trying to compile a simple pug template:

html
  head
    title Hello
  body
    h1 Header

Scala Code:

val engine = new TemplateEngine
engine.layout("temp.pug")

And I get error:

Exception in thread "main" org.fusesource.scalate.TemplateException: scala.Predef$.refArrayOps([Ljava/lang/Object;)Lscala/collection/mutable/ArrayOps;
    at org.fusesource.scalate.TemplateEngine.compileAndLoad(TemplateEngine.scala:782)
    at org.fusesource.scalate.TemplateEngine.compileAndLoadEntry(TemplateEngine.scala:745)
    at org.fusesource.scalate.TemplateEngine.liftedTree1$1(TemplateEngine.scala:446)
    at org.fusesource.scalate.TemplateEngine.load(TemplateEngine.scala:440)
    at org.fusesource.scalate.TemplateEngine.load(TemplateEngine.scala:495)
    at org.fusesource.scalate.TemplateEngine.layout(TemplateEngine.scala:593)

So is it me or the library?