When I attempt to simulate, I receive the following prompt:
An activity in a sub-model has a duplicate name with an activity in another sub-model. Example: Submodel1 and submodel3 have an activity called “Inspect.”
You can easily identify the culprit submodel by turning off each submodel, and then turn them back on one-at-a-time – running the model after each submodel is added. Once you find the problem submodel. Put a prefix in front of every activity name (i.e. S1 for submodel or S2 for submodel 2).