java - IntelliJ SDK for Plugin cannot find com.intellij.tasks -

this must painfully simple question new intellij. running 14.1 community, , created new plugin project.

this asked me set sdk, install of intellij. no problem, pointed @ idea directory.

i grabbed example source creating task repository github.

when try import of actual classes in task jar, no classdef errors over.

it shows knows com.intellij.tasks of classes missing.

what rookie mistake have made?

in order use com.intellij.tasks.* classes in plugin project, i've added plugins/tasks/lib/tasks-*.jar jars idea installation classpath of sdk used build plugin project.