"cph" differnt with lm?

c <- mice(datad1)
fitc <- with(data = c,expr = cph(Surv(time,Y)~SC))

#> pool(fitc)
Error in summary.rms(x) :
adjustment values not defined here or with datadist for SC
此外: Warning message:
In get.dfcom(object, dfcom) : Infinite sample size assumed.

need you help

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