问R：运行rms::Predict 不能识别模型变量？

install.packages("tidyverse")
install.packages("Hmisc")
install.packages("rms")
install.packages("ggplot2")
library(tidyverse)
library(Hmisc)
library(rms)
library(ggplot2)
names(clean)
str(clean)
attach(clean)
dd<-datadist(grossDQ,FT_3,fineDQ,adapDQ,langDQ,socialDQ,totalDQ)
options(datadist='dd')

fit1 <- lm(grossDQ ~ rcs(FT_3, 3),data=clean) 
summary(fit1)
W<-Predict(fit1,FT_3)