Alesis DM6 issues with macbook air and garageband

Hey everyone, I have an Alesis DM6 and a macbook air with the newest garageband. When I try to connect via usb, it doesn't work. It has nothing to do with usb-cable or ports cause I can connect my piano.

I also have an old macbook pro with an old garageband and on that computer it works, but I really would like it for the newest version.

The weird thing is, when I connect and I play the drum, it has connection for 3 seconds and then it stops. I've already tried to go back to factaory settings but that doesn't seem to do anything.

Is there anyone who can help me with this?
Greets Jochen
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