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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