[R-sig-ME] Likelihood

[Bonitta Gianluca]

First of all, thank You for all replay.
Ben could You so Gentle to produce a little silly example because i have use 
this code : 
fm1 <- lmer(Reaction ~ Days + (Days|Subject), sleepstudy, devFunOnly=TRUE)
but this message occurs...  could be a wrong pack version?
Best Bonitta