adding lifty plugin fails with sbt 0.12.1 and scala 2.9.2

[sachin kanekar]

Hi, I'm new to lifty,sbt and lift. I tried to install lifty plugin as follows, but get this error - any guidance on the correct way to install the plugin would be highly appreciated.

[error] java.lang.AbstractMethodError: org.lifty.Lifty$.globalSettings()Lscala/collection/Seq;

[error] Use 'last' for the full log.

Project loading failed: (r)etry, (q)uit, (l)ast, or (i)gnore? q

cat ~/.sbt/plugins/build.sbt 

import sbt._

import Defaults._

resolvers += Resolver.url("sbt-plugin-releases", new URL("http://scalasbt.artifactoryonline.com/scalasbt/sbt-plugin-releases/"))(Resolver.ivyStylePatterns)

//addSbtPlugin("org.lifty" % "lifty" % "1.7.4")

libraryDependencies += sbtPluginExtra("org.lifty" % "lifty" % "1.7.4", "0.11.2", "2.9.1")

Thanks - Sachin