java.lang.NoClassDefFoundError: scala/xml/NamespaceBinding

Currently I am using Intellij Ultimate 14.0.3, with Scala 1.4 plugin.

I checkout scala-lab from github at https://github.com/scala-labs/scala-labs.git, I have no problem to compile the code using maven 3.2.

But after I import the code into Intellij using "Maven", and try to build the project, I got the following error. The code is  using scala-2.11.1, and I don't know why Intellij complains this, but maven command line can compile without any issue. Any idea?

Error:scalac: Error: scala/xml/NamespaceBinding
java.lang.NoClassDefFoundError: scala/xml/NamespaceBinding
 at com.sksamuel.scapegoat.io.IOUtils$.writeHTMLReport(IOUtils.scala:21)
 at com.sksamuel.scapegoat.ScapegoatComponent$$anon$1.run(plugin.scala:55)
 at scala.tools.nsc.Global$Run.compileUnitsInternal(Global.scala:1501)
 at scala.tools.nsc.Global$Run.compileUnits(Global.scala:1486)
 at scala.tools.nsc.Global$Run.compileSources(Global.scala:1481)
 at scala.tools.nsc.Global$Run.compile(Global.scala:1582)
 at xsbt.CachedCompiler0.run(CompilerInterface.scala:126)
 at xsbt.CachedCompiler0.run(CompilerInterface.scala:102)
 at xsbt.CompilerInterface.run(CompilerInterface.scala:27)
 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
 at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
 at java.lang.reflect.Method.invoke(Method.java:606)
 at sbt.compiler.AnalyzingCompiler.call(AnalyzingCompiler.scala:102)
 at sbt.compiler.AnalyzingCompiler.compile(AnalyzingCompiler.scala:48)
 at sbt.compiler.AnalyzingCompiler.compile(AnalyzingCompiler.scala:41)
 at org.jetbrains.jps.incremental.scala.local.IdeaIncrementalCompiler.compile(IdeaIncrementalCompiler.scala:29)
 at org.jetbrains.jps.incremental.scala.local.LocalServer.compile(LocalServer.scala:26)
 at org.jetbrains.jps.incremental.scala.remote.Main$.make(Main.scala:62)
 at org.jetbrains.jps.incremental.scala.remote.Main$.nailMain(Main.scala:20)
 at org.jetbrains.jps.incremental.scala.remote.Main.nailMain(Main.scala)
 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
 at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
 at java.lang.reflect.Method.invoke(Method.java:606)
 at com.martiansoftware.nailgun.NGSession.run(NGSession.java:319)
Caused by: java.lang.ClassNotFoundException: scala.xml.NamespaceBinding
 at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
 at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
 at java.security.AccessController.doPrivileged(Native Method)
 at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
 at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
 at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
 ... 26 more