J48 not working in weka explorer

I am not able to use GUI of weka in linux (linux mint 9). 开发者_开发百科It doesn't allows me to use J48 from interface, whereas I am able to run it from command prompt.

Can anyone tell me what is can be the problem with it

J48 is expecting nominal class and therefore it is filtered out if your class is numeric.

If this is the case you should run a NumericToNominal Filter in the Preprocess stage. Note to state the index of the class column for the filter to run only on it.