How do I correct the 'Invalid root outport connection in the referenced model

 How do I correct the 'Invalid root outport connection in the referenced model 'referenced_model' error in Simulink 7.2 (R2008a)?

I have a model, which contains a referenced model. When I update the main model I receive the following error:
 
 Invalid root outport connection in the referenced model 'referenced_model'. Two different blocks drive the root Outport block 1. To be a valid connection, the root Outport block must be driven by one source port. 

 Use the 'Invalid Root Inport and Outport block connection' option on the 'Model Referencing' group of the Diagnostics page of the Configuration Parameters dialog box to control reporting of this condition.
What can I do in order to avoid this error?

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