Hello, Statalist!

I have a question about the stcurve after a multiple imputation.

So, after the following command:
mi estimate:stcox var1 var2 var3

I wanted to plot the survival probability, and used stcurve command:

stcurve, survival at1(var1=1) at2(var1=2) yla(,nogrid)

but I got an error code:
last estimates not found
r(301);

My question is: how to run stcurve after multiple imputations?