What's happening?

> Celpe.Mixed <- lme(Nota~Tarefa + Corretor %in%
Tarefa,random=~1|ID,data=Celpe.Dados11)
Error in "EMsteps<-"(`*tmp*`, value = controlvals) : 
        error code 6 from Lapack routine dtrtri
> 

I've trying to fit a Mixed model using lme from package lme4 and the error
above has occourred. What Should I Do to solve this?

Best regards
[]s
Leonard Assis
Estatístico /  CONFE 7439
UIN : 41-764-523 /  Skype : lmassis /  msn : lmassis@msn.com


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