title: Could not load definitions from resources
body: <p>I have a (hopefully) very basic question.  I'm very unfamiliar with Ant, I'm just trying to use a build file so I can write some plugins for an open source application I found recently, Rapid Miner.  I've been trying to compile it with Eclipse (following Eclipses.org's own instructions on how to do so.)  Every time I click Run though I get an error that looks like this:</p>
  
  <pre><code>Buildfile: C:\Users\jcarr14\Eclipse\Workspace\RapidMiner_Unuk\build.xml
    [taskdef] Could not load definitions from resource net/sf/antcontrib/antlib.xml. It could not be found.
  
  BUILD FAILED
  C:\Users\jcarr14\Eclipse\Workspace\RapidMiner_Unuk\build.xml:329: taskdef class   com.oracle.appbundler.AppBundlerTask cannot be found
  using the classloader AntClassLoader[]
  
  Total time: 306 milliseconds
  </code></pre>
  
  <p>It seems to me that there must be a file missing, but I can't figure out where it is supposed to be and as a result, I can't figure out if it is actually there or not, or even if Eclipse is the culprit.  I did go into the Eclipse folder and look for a net/sf/antcontrib/antlib.xml, but was unable to locate anything.</p>
  
  <p>I'm assuming that it's possible the problem is not with Eclipse at all, but with Rapid Miner.  So I looked for that same location inside of the RapidMiner project structure and was unable to find it.  I have also posted a similar question to this one on RapidMiner's forums, just in case this is RapidMiner specific.</p>
  
  <p>I suppose the basic question I need answered is how to check if Ant is installed properly in Eclipse.  Once I know that Eclipse is working fine I can then throw all my focus on figuring out what is wrong with RapidMiner...</p>