I recently installed the latest Wolfram Workbench plugin in my eclipse IDE (Neon.1a Release 4.6.1). Then I attempted to follow this old tutorial on generating docs with the documentation tool pallete: http://www.wolfram.com/broadcast/video.php?c=93&v=899
When pressing build I reiceved this message:
BUILD FAILED
/Users/admin/Documents/eclipse_workspace/test/docbuild.xml:132: The following error occurred while executing this line: /Users/admin/Documents/eclipse_workspace/test/docbuild.xml:90: taskdef A class needed by class com.wolfram.jlink.util.MathematicaTask cannot be found: org/apache/tools/ant/Task using the classloader AntClassLoader[/Applications/Mathematica.app/Contents/SystemFiles/Links/JLink/JLink.jar]