What does the Warning :The response has five or fewer unique values while building random forest mean

@harry wrote:

I am currently solving one classification problem using random forest algorithm in R .I am able to create the model, but it giving me warning I want to the reason.

randomtree=randomForest(Reverse ~ Circuit+Issue+Petitioner+Respondent+LowerCourt+Unconst,data=train,nodesize=25,ntree=200)

Warning message:
In randomForest.default(m, y, ...) :
  The response has five or fewer unique values.  Are you sure you want to do regression?

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