[R] temporal replication

[Rita]

Can someone please help me with this 
I am trying to use this model because I have temporal replication in my data

results<-read.table(file=file.choose(),header=T)
attach(results)
names(results)
results<-na.omit(results)
library(nlme)
library(lattice)
results<-groupedData(weight~date|group,outer=~diet,results)
plot(results)
plot(results,outer=T) 
model<-lme(weight~diet,random=~date|group,results)          everything
worked till here 
although when I compute the model this error appears Error in
lme.formula(weight ~ diet, random = ~date | group, results) : nlminb
problem, convergence error code = 1
message = iteration limit reached without convergence (9)
summary(model)
http://n4.nabble.com/file/n931181/rawoctobercalciumexperiment2.txt
rawoctobercalciumexperiment2.txt 
kind regards 
thank you in advace

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