Error installing timeseriesForecasting plugin

Hi all,

I'm trying to install the time series Forecasting plugin through the package manager GUI but I get the following error:

java.io.IOException: Unable to create temporary file
at java.io.File$TempDirectory.generateFile(File.java:1891)
at java.io.File.createTempFile(File.java:1979)
at java.io.File.createTempFile(File.java:2032)
at org.pentaho.packageManagement.DefaultPackageManager.downloadArchive(Unknown Source)
at org.pentaho.packageManagement.DefaultPackageManager.installPackageFromURL(Unknown Source)
at org.pentaho.packageManagement.DefaultPackageManager.installPackageFromRepository(Unknown Source)
at weka.core.WekaPackageManager.installPackageFromRepository(WekaPackageManager.java:1389)
at weka.gui.PackageManager$InstallTask.doInBackground(PackageManager.java:1272)
at weka.gui.PackageManager$InstallTask.doInBackground(PackageManager.java:840)
at javax.swing.SwingWorker$1.call(SwingWorker.java:296)
at java.util.concurrent.FutureTask.run(FutureTask.java:262)
at javax.swing.SwingWorker.run(SwingWorker.java:335)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:724)


I'm using Mac OS X version 10.8.4, Oracle java version 1.7.0_40-b43 (64 bits) and weka version 3.7.10-oracle-jvm.

Any help would be appreciated. I really don't know which way to go to get it installed.
Thanks,

Emma