CDJ 2000 Nexus 2 Matching function not working

Hi Everyone, I'm really a new user of CDJ 2000 Nexus 2, well honestly I'm new in all senses. 

I was wondering what I'm doing wrong because I'm not able to see any matching songs on any player while all the system (DJM 900 Nexus 2 and 2 x CDJ 2000 nexus 2)is linked with Network cables (link) to my Mac running Rekordbox in export mode.

There are no songs on the list and everything appears "grey". I tried also by connecting via USB .... without luck.

I know it's me...anyone may help me with the settings?

Thank you in advance....