Cant play my own tracks that I import !!!! Please help.

Hey, I'm a producer and currently started DJing.
I export my tracks from Ableton in WAV file to my pc and to a USB, but I can't open them on my XDJ-XZ, it says "File not supported".
Tried to convert it to FLAC, still did not work, even if I analyse it on Rekordbox before.
Any help would be appreciated!!!
Couldn't play my tracks in gigs, unfortunately.