求教

library(randomForest)

library(mlbench)

library(caret)

control <- trainControl(method="repeatedcv", number=10, repeats=3, search="grid")

set.seed(seed)

tunegrid <- expand.grid(.mtry=c(1:15))

rf_gridsearch <- train(FGL3_train$pulsarness~., .......)

后报错

错误：unknown column “FGL3_train”“pulsarness”

这两列数据都存在可查看，代码在他人电脑上正常运行，求教报错原因？是否为版本问题？