This seems to be occurring when I try and constrain values across different matrices by label, then use omxAssignFirstParameters to set starting values - omxSetParameters gives the " 'labels' must not contain duplicate values" error. When I use the same label within the same matrix there is no problem. When browsing into the error, I see that indeed, the labels object within omxSetParameters contains duplicates only when they are specified from different matrices.
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