[R] Error in y - ymean : non-numeric argument to binary operator

[ddkssk 909]

I am trying to do classification with Randomforest() . the class variable
is nominal.

But I get this error
model1 <-randomForest(Cath~.,data=trainrf)
Error in y - ymean : non-numeric argument to binary operator
In addition: There were 26 warnings (use warnings() to see them)
>  model1
Error: object 'model1' not found

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