This "Please try again" business started recently for me.
Streaming via Bluetooth works fine including finding album art. Pandora and stitcher work fine once connected with USB. But 4 out of 5 times music via my ipod function on my iPhone 4S fail. I get the fail screen. Playing podcasts fail every time. The audio comes thru fine but the entire screen is covered by the error. Oh the car is a '13 Terrain SLT-1.
I think it started after iOS 7 update? But it's been flakey before.