Searched on Google with the first line of a JAVA stack trace?

We can recommend more relevant solutions and speed up debugging when you paste your entire stack trace with the exception message. Try a sample exception.

Recommended solutions based on your search

Solutions on the web

via Stack Overflow by Kerim Caner Tümkaya
, 1 year ago
weka.core.UnassignedClassException: Class index is negative (not set)! at weka.core.Instances.numClasses(Instances.java:915) at weka.classifiers.evaluation.Evaluation.<init>(Evaluation.java:461) at weka.classifiers.evaluation.Evaluation.<init>(Evaluation.java:441) at weka.classifiers.Evaluation.<init>(Evaluation.java:211) at weka1.Weka1.classify(Weka1.java:84) at weka1.Weka1.main(Weka1.java:193)