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 EstatÃstico / CONFE 7439 UIN : 41-764-523 / Skype : lmassis / msn : lmassis@msn.com [[alternative HTML version deleted]]