Survey package: using subset option with svyrepdesign

Hi. I'm using American Housing Survey (AHS) data with replicate weights. I
want subpopulation estimates. When I try to subset the survey design, I get
an error message. I don't get the error message when not using the replicate
weights (using  the regular svydesign function). 

Any help would be appreciated. My code and error message are below.

dsn <-
svrepdesign(weights=~wgt90geo,repweights=~repwgt,type="Fay",data=temp2,combined.weights=TRUE,rho=.5)
dsub <- subset(dsn,subpop==TRUE)

Error in x$variables[i, , drop = FALSE] : incorrect number of dimensions

Thanks,
Brent Mast
HUD



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