Thank you for the additional information.
The code you provide fits 57 or so models, only one of which includes LSMEANS statements. That model does not report an LSMEANS table because the model does not converge. Yes, there was no reported "ERROR" but there is this WARNING in the log file:
WARNING: Stopped because of infinite likelihood.
WARNINGs and even NOTEs can indicate a bad model; do not look just for ERRORs.
You have only 12 animals, and it is overly optimistic to expect that you would be able to adequately estimate a complex covariance structure like the ARH(1)+RE model with the LSMEANS statements in your code. Even if a model with a complex covariance structure converges, it may not be statistically better than a more parsimonious covariance structure. A thoughtful and careful approach to selecting a covariance structure is preferable to a blind "fit all possible structures and see what happens" approach.
Are you having problems with the LSMEANS statements for a model with a covariance structure that is well-supported by your data? If so, please provide code that includes only the problematic portion so that we know where to focus our attention: please do not send your entire code.
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