Help with lme4 model specification

Thanks for your response.
This is suspicious : Spar_loc doesn't appear in your statement...
Yes Spar_loc should look suspicious.  I posted the real error messages but
hid the variable names in the model.  Spar_loc is the original form of S.
The precedence of modelling operators is not very clear (and does not
seem to be formally defined in the "standard" documentation...). In
doubt, use parentheses.
So try ...+(1|(S:A)/H), just in case..
This did not work.  However I did discover something that does:

AAT<- lmer(Y ~ S + A + (1|H %in% S:A), data=AT, REML=TRUE) 

Not sure why this worked.  I read that it is an alternate way of specifying
nesting.

This runs without error.

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Help with lme4 model specification

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