Reported by Kinesia:
If you (foolishly) are running a getall scan and a resale search at the same time and try and purchase something from Resale, it gives you this error endlessly. It should only give it once and move that scan to the end of the getall scan. (at least I think that's probably the recommended behaviour.) You might very well miss the auction. but your workflow would continue.
brykrys's note: CoreBuy tries to start new scans from OnUpdate, so I can see this will spam the error every frame