[R-sig-ME] Error in predict a linear mixed model with predict

[m.tasallizadeh]

Hi Dear Dr bolker.
Hope you are in good health. I amMeysam Tasallizadeh, a MSc. student in 
statistics at Tarbiat Modares University, Tehran, Iran. I plan to work on 
longitudinal data in my thesis.
I want to predict a linear mixed model with predict function that is below:

predict(f1,full.data)
Error in (function (x, n)  : new levels detected in newdata

full.data is dataframe that the has dimension 3600x6 and f1 is beloow:
            f1 
<-lmer(y~time+time|indiv,data=comp.data[comp.data$weight!=0,],REML=REML,weights=NULL) 
# lme fit.

I would highly appreciate it if you consider my question in error in predict 
linear mixed model.
meysam tasallazadeh khemes
MSc. student of    Statistics
Department of Statistics
Faculty of Mathematical Sciences
Tarbiat Modares University
Tehran -  Islamic republic of Iran
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