Trade Data Error

I am working on an economic impact for a property that is located within Pittsburgh. The client has asked that we show what the impact is for the city of Pittsburgh, along with what it would be for the rest of the county. Due to the way in which the zip code files are built, I was advised that an MRIO would not be feasible. Knowing this, we decided to run two separate models: one on the entire county, and one only including the zip codes located within the city. The difference would be considered the impact experienced outside of Pittsburgh, but within Allegheny county. Everything worked fine, however, when I built my city model, which contained about 31 zip codes, I got the following error (image attached): [b]Trade Data Error The Trade Flows data could not be located, do you want to use Econometric RPC?[/b] When I clicked "Yes" everything went smoothly, but I wanted to make sure this is not skewing my results somehow.