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

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at weka.classifiers.timeseries.core.TSLagMaker.removeExtraneousAttributes(
at weka.classifiers.timeseries.core.TSLagMaker.getTransformedData(
at weka.classifiers.timeseries.WekaForecaster.buildForecaster(
at weka.classifiers.timeseries.eval.TSEvaluation.evaluateForecaster(
at weka.classifiers.timeseries.eval.TSEvaluation.evaluateForecaster(
at com.TimeSeries.TimeSeries.readAndConverFile(
at com.TimeSeries.Start.callMethods(
at com.TimeSeries.Start.main(

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