iPod Nano 7th Gen gets "unsupported" error message hen connecting to Bose player

Hi, i have an iPod Nano touch 7th gen and use a 30 pin adapter when connecting to my Bose docking station. I also have an aftermarket adapter that plays through my car radio that I use too. It has worked fine until recently. I get the "Unsupported" accessory is not supported message that really makes no sense at all. Having the typical disappointing experience with Apple support...Any help would be appreciated. Thanks