java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at weka.classifiers.timeseries.core.TSLagMaker.removeExtraneousAttributes(TSLagMaker.java:3102)
at weka.classifiers.timeseries.core.TSLagMaker.getTransformedData(TSLagMaker.java:3138)
at weka.classifiers.timeseries.WekaForecaster.buildForecaster(WekaForecaster.java:1037)
at weka.classifiers.timeseries.eval.TSEvaluation.evaluateForecaster(TSEvaluation.java:652)
at weka.classifiers.timeseries.eval.TSEvaluation.evaluateForecaster(TSEvaluation.java:600)
at com.TimeSeries.TimeSeries.readAndConverFile(TimeSeries.java:134)
at com.TimeSeries.Start.callMethods(Start.java:15)
at com.TimeSeries.Start.main(Start.java:10)

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