machine learning - WEKA 3.7.10 not compatible format, class index differ -


i use weka text classification, have train set , untagged test set, goal classify test set.

in weka 3.6.6 goes well, can select supplied test set , train model , result.

on same files, weka 3.7.10 says

train , test set not compatible. automatically wrap classifier in "inputmappedclassifier" before porceeding? 

and when press no outputs following error message

problem evaluating classfier: train , test not compatible class index differ : 2!= 0 

i understand key class index differ: 2!= 0.

however mean? why works in weka 3.6.6 , not compatible in weka 3.7.10? how can make test set compatible train set?

when import supplied test set, selecting same class attribute 1 use in train set? if don't change field, weka selects last attribute being class automatically.


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