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lmer warning message

"H. Büttger" 
Hi,

I am getting these two warning message for different data when I'am 
using a lmer (R version 2.5.1):

Fehler in if (any(sd < 0)) return("'sd' slot has negative entries") : 
Fehlender Wert, wo TRUE/FALSE n?tig ist

and

CHOLMOD warning: matrix not positive definite
Fehler in objective(.par, ...) : Cholmod error `matrix not positive 
definite' at file:../Supernodal/t_cholmod_super_numeric.c, line 614


Whats does it mean?


Thanks for your help!

Heike