I just had the same issue. You need to download the samples seperately. They are not in the plug jar. You can get them at https://ieplugin4rm.svn.sourceforge.net/svnroot/ieplugin4rm/informationextractionplugin_Vega/trunk/informationExtraction_Vega/samples/
I just downloaded them individually into a folder called samples and then created a repository to point towards that. (It is important to name them as given: ".rmp" or ".properties" as oppposed to just ".xml".) You can probably check out the whole folder in sourceforge but I am not familiar with sourceforge so I just did it this simple way.
They work ok now. There is a problem with the visualiser node in there though I think that is entirely a seperate issue. So I raised another post on this:http://rapid-i.com/rapidforum/index.php/topic,6042.0.html