model "does not contain a RAM objective function"

Hi,

I'm having some trouble and have been getting an error message that reads:

"Error: The RAM model 'MZ' does not contain a RAM objective function."

What has me perplexed is that I specify what OpenMx should take into account when evaluating the model (for both groups in a BG study):

mxFIMLObjective(covariance="R", means="M", dimnames=manifests, thresholds="expThresholds")
mxAlgebra(expression=MZ.objective + DZ.objective, name="minus2sumll" ),
mxAlgebraObjective("minus2sumll")

Thank you for any insight.

UPDATE: I figured it out. The error (which should have been obvious) is that I mislabeled the model type.