Iphone app crashes after few sec. when connected to CDJ2000 Nexus

Hi There!

When i connect my iphone 7 to a CDJ2000 Nexus with the usb/ligtning cable,
the Rekordbox app crashes after 5 or 6 seconds??

I can see on my cdj when i have usb enabled the tracklisting 4 a few seconds and then it dissapears cuz the app crashes.
I used the orignal iphone cable, which is brand new

I'm on iOS 10.2.1
Rekordbox app ver. 2.1.3
Rekordbox v.4.4.0
Pioneer CDJ2000 Nexus v.1.41

I hope someone can help me out!

thanks in advance!