java.lang.IllegalArgumentException: Value not defined for given nominal attribute!

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Value not defined for given nominal attribute!
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Value not defined for given nominal attribute!
java.lang.IllegalArgumentException: Value not defined for given nominal attribute!
at weka.core.AbstractInstance.setValue(AbstractInstance.java:521)
at cj.weka.CJWeka.floatstringToInst(CJWeka.java:365)
at cj.weka.CJWeka.addInstance(CJWeka.java:243)

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