我是一名R的初学者，现在想用随机森林做分类预测，然后用来生存分析，下面是我运行的代码，但是总出现错误，请各位帮我看看，非常感谢大家！
train<-read.table("C:\\Users\\Administrator\\Desktop\\新建文件夹\\training1 .txt",
heade=T)
test<-read.table("C:\\Users\\Administrator\\Desktop\\新建文件夹\\test1.txt",
heade=T)
library(randomForest)
rf<-randomForest(zhonglei~.,data=train,ntree=1000,mtry=2,importance=TRUE)
print(ranfor)
pred<-predict(rf,test)
print(pred)

Error in randomForest.default(m, y, ...) :
  Can not handle categorical predictors with more than 53 categories.
In addition: Warning message:
In randomForest.default(m, y, ...) :
  The response has five or fewer unique values.  Are you sure you want to do regression?