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i also get this message because my aftermarket alarm (karr) installed by the dealer overpowers the frequency of the regular remote. a major pain in the ***!
It's also possible, there's too much radio interference (running at or near the RF) where you are at, causing the car not to be able to see the fast key.
iPhone will do it for sure. If I reflash the ROM with the door open and key in pocket, it complains too. I put the key in the center when flashing just in case.