Before running ExtractionPostprocessingApplication, make sure that you ran all required
processes before (i.e. you successfully extracted all wikis you want to postprocess now).
There are other applications provided to do just that and to get here (WikiaDumpDownloadApplication,
ExtractionApplication).
When executing the program EvaluationApplication make sure that you previously ran the
process with includeNullMappings = true in the config.properties file (default: false).
You have to place the evaluation file for each wiki within the wiki folder in postProcessedWikis.