[R-sig-ME] help: error in fn(x, ...): Downdated VtV is not positive definite

[Ahreum Maeng]

Hello,

I got a following error message while running a MLM using lme4 package.

Error in fn(x, ...) : Downdated VtV is not positive definite


my model was as following:

out <- lmer(situ ~ cult*change + (change || id) + (0 + frace | type), data
= tidy.total, REML=FALSE)

where
situ:  numeric
change: numeric
cult: factor (coded in 1 and -1)


How could I fix this issue?

Thanks a lot,
Ahreum

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