用mice包进行多重插补时出现以下错误，为什么啊，求帮忙

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imp<-mice(mydata,m=5,method="rf")There were 50 or more warnings (use warnings() to see the first 50)警告信息：1: In randomForest.default(x = xobs, y = yobs, ntree = 1,  ... :  The response has five or fewer unique values.  Are you sure you want to do regression?

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关键词：MICE 多重插补 mic ice 求帮忙

There were 50 or more warnings (use warnings() to see the first 50)
警告信息：
1: In randomForest.default(x = xobs, y = yobs, ntree = 1,  ... :
  The response has five or fewer unique values.  Are you sure you want to do regression?
2: In randomForest.default(x = xobs, y = yobs, ntree = 1,  ... :
  The response has five or fewer unique values.  Are you sure you want to do regression?
就是出现这个错误，怎么解决啊

因变量有几个分类变量，还有几个是num

说错了，因变量为二分类变量，自变量有几个是二分类变量，有几个是数值型变量