It's nothing. Your PC is configured to prevent the GUI from asking CP a question. The question it is asking is this: "What search parameters should I offer to help the user do a search on CP?" Then CP normally answers with things like "Search by Vendor" followed by a list of vendors, "Search by Category" followed by a list of categories. 

I am sorry that I did not suppress the error message when I built it. I thought people would like to know that searching the store will not be possible. I did not anticipate the situation that is created when a user absolutely never allows their computer to talk to the Internet.

None of the beta testers reported this, which is when such scenarios are usually revealed. Otherwise if I had understood how a non-trivial number of people are affected by this, I would have added an option to disable CP search.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)