I received this error when trying to run a latent growth curve model:

Error: The expected covariance matrix associated with the FIML objective in model 'MZ' is not of the same length as the dimnames provided by the objective function.

I used the traceback() function to try to determine the error and received the following output:

9: stop(msg, call. = FALSE)

8: updateObjectiveDimnames(.Object, job, model@name, "FIML")

7: genericObjModelConvert(flatObjective, job, model, namespace,

flatJob)

6: genericObjModelConvert(flatObjective, job, model, namespace,

flatJob)

5: translateObjectivesHelper(job, submodel, namespace, flatJob)

4: translateObjectivesHelper(model, model, namespace, flatModel)

3: translateObjectives(model, namespace, flatModel)

2: runHelper(model, frontendStart, intervals, silent, suppressWarnings,

unsafe, checkpoint, useSocket)

1: mxRun(lgcACEModel)

I am not sure how to interpret this message, or how to correct the script. Any help would be greatly appreciated! I have attached my script, and can upload my data if that is helpful.

Thank you!