横から失礼します
ここにあるキャッシュファイルが壊れたのではないでしょうか？WBPP起動時に読み込むようなので・・・
In some cases there are reports of similar problems caused by damaged or excessively large cache files. Look in your app data folder (which varies depending on the OS you are running under) for WeightedBatchPreprocessing-001-pxi.cache and delete it.