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java.lang.NoClassDefFoundError: org.apache.commons.math3.util.MathArrays	at org.apache.commons.math3.analysis.interpolation.SplineInterpolator.interpolate(SplineInterpolator.java:81)	at com.arionsensor.algorithm.helper.legs.normalize(legs.java:40)	at com.arionsensor.algorithm.helper.StepDetection.initStep(StepDetection.java:130)	at com.arionsensor.algorithm.bean.Data.(Data.java:178)	at com.arionsensor.ArionMaster.start(ArionMaster.java:62)	at com.arionsensor.ArionMaster.doInBackground(ArionMaster.java:163)	at com.arionsensor.ArionMaster.doInBackground(ArionMaster.java:15)	at android.os.AsyncTask$2.call(AsyncTask.java:288)	at java.util.concurrent.FutureTask.run(FutureTask.java:237)