0.30.375 only for java 7?

Hi,

I have an exception with 0.30.375 and Idea 13.0.2 (running with jdk 6), when I am trying to compile a maven project.
Is the plugin use some API from Java 7 ? Is it still compatible with jdk 6?

Thanks.

Internal error: (java.io.IOException) Cannot create output directory: ......./target/classes
java.io.IOException: Cannot create output directory: /Users/leifhallgren/Dev/workspaces/Xingtech/sparta/sparta-log/sparta-log-slf4j/target/test-classes
 at org.jetbrains.jps.incremental.scala.data.CompilationData$.checkOrCreate(CompilationData.scala:73)
 at org.jetbrains.jps.incremental.scala.data.CompilationData$.from(CompilationData.scala:41)
 at org.jetbrains.jps.incremental.scala.ScalaBuilderDelegate$$anonfun$compile$1$$anonfun$apply$1.apply(ScalaBuilderDelegate.scala:39)
 at org.jetbrains.jps.incremental.scala.ScalaBuilderDelegate$$anonfun$compile$1$$anonfun$apply$1.apply(ScalaBuilderDelegate.scala:38)
 at scala.util.Either$RightProjection.flatMap(Either.scala:523)
 at org.jetbrains.jps.incremental.scala.ScalaBuilderDelegate$$anonfun$compile$1.apply(ScalaBuilderDelegate.scala:38)
 at org.jetbrains.jps.incremental.scala.ScalaBuilderDelegate$$anonfun$compile$1.apply(ScalaBuilderDelegate.scala:37)
 at scala.util.Either$RightProjection.flatMap(Either.scala:523)
 at org.jetbrains.jps.incremental.scala.ScalaBuilderDelegate.compile(ScalaBuilderDelegate.scala:37)
 at org.jetbrains.jps.incremental.scala.IdeaIncrementalBuilder$.build(IdeaIncrementalBuilder.scala:45)
 at org.jetbrains.jps.incremental.scala.ScalaBuilder.build(ScalaBuilder.scala:29)
 at org.jetbrains.jps.incremental.IncProjectBuilder.runModuleLevelBuilders(IncProjectBuilder.java:1084)
 at org.jetbrains.jps.incremental.IncProjectBuilder.runBuildersForChunk(IncProjectBuilder.java:801)
 at org.jetbrains.jps.incremental.IncProjectBuilder.buildTargetsChunk(IncProjectBuilder.java:849)
 at org.jetbrains.jps.incremental.IncProjectBuilder.buildChunkIfAffected(IncProjectBuilder.java:764)
 at org.jetbrains.jps.incremental.IncProjectBuilder.buildChunks(IncProjectBuilder.java:587)
 at org.jetbrains.jps.incremental.IncProjectBuilder.runBuild(IncProjectBuilder.java:344)
 at org.jetbrains.jps.incremental.IncProjectBuilder.build(IncProjectBuilder.java:184)
 at org.jetbrains.jps.cmdline.BuildRunner.runBuild(BuildRunner.java:129)
 at org.jetbrains.jps.cmdline.BuildSession.runBuild(BuildSession.java:224)
 at org.jetbrains.jps.cmdline.BuildSession.run(BuildSession.java:113)
 at org.jetbrains.jps.cmdline.BuildMain$MyMessageHandler$1.run(BuildMain.java:133)
 at org.jetbrains.jps.service.impl.SharedThreadPoolImpl$1.run(SharedThreadPoolImpl.java:41)
 at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:439)
 at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
 at java.util.concurrent.FutureTask.run(FutureTask.java:138)
 at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895)
 at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918)
 at java.lang.Thread.run(Thread.java:680)
Caused by: java.lang.NoSuchMethodError: java.io.File.toPath()Ljava/nio/file/Path;
 at org.jetbrains.jps.incremental.scala.data.CompilationData$.checkOrCreate(CompilationData.scala:74)
 ... 28 more