R help - Dec 2006 - stepAIC

Sorry I made  a mistake for the variables in the model:
   
   
   
  fm0.lmer <- lmer(Y ~ time+x1+x2 + (1|ID), data = dfr, family = binomial)
   
  fm.lmer <- stepAIC(fm0.lmer,scope = list(upper = ~ time*x1*x2, lower =
~1,trace = FALSE))
   
  I obtain the following error:
   
  Error in terms.default(object) : no terms component
   
  I would be very grateful for any suggestion,
   
  Bernard,
  


 		
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