[R] An "unsubsettable object" in a mixed model

[sj414]

R has no problem with a command of the type
  model<-lme(Y~f(x),random=~x|z)
but returns that error message when the command becomes something like
   model<-lme(Y~f(X),random=~x|z,correlation=corCompSymm)
Y is a vector of single observations from 2099 individuals, X is the
covariate matrix of which x is one column, z is the family numbers; 1-1801.
It seems to be the addition of dependence which causes the problem.


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