covariate search -- "object covInfo' not found error

[snailittle]

rxode2::.rxWithWd(tempdir(), {# with temporary directory
library(nlmixr2)
library(rxode2)
library(vpc)
library(xpose)
library(xpose.nlmixr2)
library(ggplot2)

pheno <- function() {
ini({
tcl <- log(0.008) # typical value of clearance
tv <- log(0.6) # typical value of volume
## var(eta.cl)
eta.cl + eta.v ~ c(1,
0.01, 1) ## cov(eta.cl, eta.v), var(eta.v)
# interindividual variability on clearance and volume
prop.err <- 0.1 # residual variability
})
model({
cl <- exp(tcl + eta.cl) # individual value of clearance
v <- exp(tv + eta.v) # individual value of volume
ke <- cl / v # elimination rate constant
d/dt(A1) = - ke * A1 # model differential equation
cp = A1 / v # concentration in plasma
cp ~ prop(prop.err) # define error model
})
}

fit_focei <- nlmixr(pheno, pheno_sd, "focei",
control=list(print=0),
table=list(cwres=TRUE, npde=TRUE))

auto3 <- covarSearchAuto(fit_focei, varsVec = c("v", "cl"), covarsVec = c("WT","APGR"),
restart = TRUE,
searchType = "backward", pVal=list(fwd=0.01,bck=0.001))
})

.... # it was running for quite a while and everything seems OK, then it comes the error below;

Error in backwardSearch(varsVec, covarsVec, catvarsVec, fitorig = fit, :
object 'covInfo' not found

[mattfidler]

Thanks for reporting @snailittle

I will look at it when I get a chance.